Megerősítem a kártyaszámot és a személyazonosságot.

It is built from three parts:

• meg- = a verbal prefix that often adds a sense of completion or result
• erősít = to strengthen, to confirm
• -em = I in the definite present conjugation

So megerősítem means I confirm it or I am confirming it, with the idea that the confirmation is being carried out as a complete act.

Because the verb is taking a definite object.

In Hungarian, many verbs have two present-tense patterns:

• indefinite conjugation: used when there is no specific object, or the object is indefinite
• definite conjugation: used when the object is definite

Here the objects are:

• a kártyaszámot = the card number
• a személyazonosságot = the identity

Since they are specific and marked with a, Hungarian uses the definite verb form:

• megerősítem = I confirm it / them

If you said megerősítek, it would sound more like I confirm in a general sense, not I confirm the specific thing(s).

They are in the accusative case, which marks the direct object of the verb.

The basic accusative ending in Hungarian is -t, but very often a linking vowel appears before it:

• kártyaszám → kártyaszámot
• személyazonosság → személyazonosságot

So these forms mean:

• kártyaszámot = card number as the thing being confirmed
• személyazonosságot = identity as the thing being confirmed

In this sentence, both nouns are direct objects of megerősítem.

It is a compound word:

• kártya = card
• szám = number

So:

• kártyaszám = card number
• kártyaszámot = card number in the accusative

Hungarian makes compound nouns very freely, and this is a very common pattern.

It means identity, especially in the sense of a person's official or legal identity.

It is also a compound:

• személy = person
• azonosság = identity, sameness

So személyazonosság is literally something like personal identity.

In official or formal language, this is a normal word. It does not mean the physical ID card itself. If you mean ID card, Hungarian would use something like személyi igazolvány.

A is the Hungarian definite article before a consonant. Its counterpart is az before a vowel.

So:

• a kártyaszámot because kártyaszámot starts with k
• a személyazonosságot because személyazonosságot starts with sz

It is repeated because there are two coordinated definite nouns:

• a kártyaszámot és a személyazonosságot

Repeating the article is very natural and standard in Hungarian. It makes it clear that both nouns are separate definite objects.

In many verbs, meg- adds a sense of:

• completion
• successfully carrying out an action
• reaching a result

So compare the idea:

• erősít = to strengthen / confirm
• megerősít = to confirm, to make firm, to explicitly validate

In this sentence, meg- helps give the standard sense of confirming something as a completed act.

No, Hungarian word order is fairly flexible, but changing it changes the focus or emphasis.

The given sentence:

• Megerősítem a kártyaszámot és a személyazonosságot.

is a neutral way to say it.

You could also say:

• A kártyaszámot és a személyazonosságot megerősítem.

This puts more focus on what is being confirmed.

So the meaning stays very close, but the information structure changes.

It can mean either, depending on context.

Hungarian present tense often covers both:

• simple present: I confirm
• present progressive: I am confirming

So megerősítem by itself does not force the same distinction English does. The surrounding situation tells you which English translation fits best.

A few useful points:

• Hungarian stress is almost always on the first syllable of each word.
• Long vowels matter: á, é, í, ó, ő are different from short vowels.

Very roughly:

• Megerősítem → ME-ge-rő-shí-tem
• a → short aw
• kártyaszámot → KAAR-tya-saa-mot
• és → like a long aysh without the final h
• a személyazonosságot → a SE-mey-a-zo-nosh-shaa-got

A few sound notes:

• sz is pronounced like English s
• s is pronounced like English sh
• ty is a soft sound, somewhat like British English t in tune for some speakers, though not identical

So személyazonosságot contains both:

• sz = s
• ság with s = sh

Yes. Hungarian can add possession directly to the noun.

For example:

• kártyaszámom = my card number
• kártyaszámomat = my card number as a direct object
• személyazonosságom = my identity
• személyazonosságomat = my identity as a direct object

So I confirm my card number and my identity could be:

• Megerősítem a kártyaszámomat és a személyazonosságomat.

But in many real contexts, Hungarian may leave possession unspoken if it is already obvious.