Το IBAN είναι σωστό.

Το is the neuter singular definite article, meaning the.

In Greek, it is very common to use the definite article with a specific noun, even with foreign words and acronyms. Here, IBAN is treated like a neuter noun, so Greek says το IBAN = the IBAN.

Greek adjectives must agree with the noun they describe in gender and number.

Here, IBAN is treated as neuter singular, so the adjective is also neuter singular:

• masculine: σωστός
• feminine: σωστή
• neuter: σωστό

So:

• Το IBAN είναι σωστό.

If you used a different noun, the adjective would change. For example:

• Ο αριθμός IBAN είναι σωστός. = The IBAN number is correct.

Here αριθμός is masculine, so the adjective becomes σωστός.

Είναι means is.

It is the 3rd person singular form of to be. So the sentence structure is:

• Το IBAN = the IBAN
• είναι = is
• σωστό = correct

So literally: The IBAN is correct.

Normally, no. In a standard full sentence, Greek usually keeps the verb είναι.

So:

• Το IBAN είναι σωστό. = natural, complete

But:

• Το IBAN σωστό. = not standard as a normal sentence

In notes, labels, or very informal speech, people sometimes shorten things, but as a learner you should use είναι.

It can mean all of those depending on context.

In this sentence, σωστό usually means something like:

• correct
• right
• sometimes valid

With an IBAN, the idea is usually that the IBAN has been entered correctly or is the proper one.

Yes, Greek word order is more flexible than English, although not all orders sound equally neutral.

The most neutral version is:

• Το IBAN είναι σωστό.

You may also hear:

• Είναι σωστό το IBAN.
• Σωστό είναι το IBAN.

These alternatives can change the emphasis slightly. For example, they may sound like you are focusing on correct or contrasting it with something else. For general use, stick with:

• Το IBAN είναι σωστό.

Because foreign acronyms are usually indeclinable in Greek. That means the acronym itself often stays the same.

Instead of changing the word IBAN, Greek shows grammatical information through words around it, such as:

• the article: το
• the adjective: σωστό

So the grammar is carried by the Greek words, not by the acronym.

Usually no, not in a normal sentence.

For a specific IBAN, Greek strongly prefers the article:

• Το IBAN είναι σωστό.

Without the article, it sounds unnatural or incomplete in ordinary speech. You might see article-less forms in headings, forms, or shorthand, but not as the standard full sentence pattern.

For the negative, add δεν before είναι:

• Το IBAN δεν είναι σωστό. = The IBAN is not correct.

For a yes/no question, Greek often keeps the same word order and uses intonation, or a question mark in writing:

• Το IBAN είναι σωστό; = Is the IBAN correct?

So the basic pattern is very straightforward.

The written accent mark shows the stressed syllable:

• είναι → stress on εί
• σωστό → stress on στό

So roughly:

• EIN-eh
• so-STO

The article το is unstressed in normal speech.

As for IBAN, Greek speakers often keep it in Latin letters, and pronunciation can vary somewhat in real life depending on the speaker and context.

Not always, but neuter is very common, especially for foreign acronyms and indeclinable terms.

So learners will often see acronyms treated as neuter by default, especially in practical, modern usage. That is why το IBAN sounds natural here.

But grammatical gender in Greek can also depend on the underlying noun or on established usage, so it is best to learn each common acronym as it is actually used.

Yes. The pattern is very common:

• Το παιδί είναι σωστό. = The child is correct/right (less common in meaning, but grammatically similar)
• Το όνομα είναι σωστό. = The name is correct.
• Το ποσό είναι σωστό. = The amount is correct.

So το + noun + είναι + neuter adjective is a very normal Greek structure when the noun is neuter singular.