Nummeret er tusind.

Because Danish usually puts the definite article at the end of the noun instead of using a separate word in front.

• et nummer = a number
• nummeret = the number

So the -et ending here means the.

It is an et-word, also called a neuter noun.

That is why you say:

• et nummer = a number
• nummeret = the number

If it were an en-word, the definite form would normally end in -en, but that is not the case here.

Er is the present tense of at være (to be).

So in this sentence, it works just like English is:

• Nummeret er tusind. = The number is one thousand.

A useful thing to remember is that Danish verbs do not change for person the way English sometimes does. So Danish uses the same present-tense form with all subjects:

• jeg er
• du er
• han/hun er
• vi er

Because after er, Danish normally uses the bare number word when you are stating what the number is.

So:

• Nummeret er tusind. = correct

Using et tusind here would sound unnatural in ordinary Danish.

This is similar to how English says:

• The number is one thousand

not usually

• The number is a one thousand

No, not here. Tusind is a numeral, and numerals in Danish usually do not change form in this kind of sentence.

So tusind stays tusind whether the noun before it is common gender, neuter, definite, or indefinite.

That is different from articles like en and et, which do change.

This is the normal Danish main-clause order:

subject + verb + complement

• Nummeret = subject
• er = verb
• tusind = complement

So the structure is very straightforward.

It also follows the general Danish rule that the finite verb comes in the second position in a main clause. Since the subject comes first here, the verb naturally comes right after it.

It depends on context. Nummer can refer to many kinds of numbers, for example:

• a phone number
• a room number
• a ticket number
• a jersey number
• an item number

So Nummeret er tusind could mean that some assigned or identifying number is 1000.

Context tells you which kind of number it is.

Yes, but the meaning focus is a bit different.

• nummer is often used for an identifying number, like a phone number or room number
• tal is more the mathematical idea of a number as a numerical value

So:

• Nummeret er tusind sounds natural for an assigned number
• Tallet er tusind sounds more mathematical or abstract

Both can be correct, but they are not always interchangeable.

You usually make a yes/no question by putting the verb first:

• Er nummeret tusind? = Is the number one thousand?

That verb-first pattern is very common in Danish questions.

You put ikke after the verb:

• Nummeret er ikke tusind. = The number is not one thousand.

So the basic pattern is:

subject + er + ikke + complement

The two most common things are:

1. The definite article is attached to the noun
   English: the number
   Danish: nummeret

2. No article is used before the numeral
   English: is one thousand
   Danish: er tusind

So even though the sentence is short, it shows two very typical Danish patterns.