Die eisnommer is op die dokument.

Afrikaans very often makes compound nouns by joining words together.

So:

• eis = claim
• nommer = number
• eisnommer = claim number

In English, we usually write claim number as two words, but in Afrikaans it is natural to write it as one compound word.

Because each noun phrase needs its own definite article:

• Die eisnommer = the claim number
• die dokument = the document

Afrikaans uses die for the regardless of gender, and it is also used for plural nouns. That makes it much simpler than languages that change the article.

No. Afrikaans does not have different forms of the for grammatical gender the way some other languages do.

So you use die with all of these:

• die man = the man
• die vrou = the woman
• die kind = the child
• die dokumente = the documents

This is normal Afrikaans main-clause word order:

• Subject: Die eisnommer
• Verb: is
• Rest of the sentence: op die dokument

So it follows the same basic pattern as English: The claim number is on the document.

It is similar, but even simpler in one important way.

In the present tense, Afrikaans uses is with all persons:

• Ek is = I am
• Jy is = you are
• Hy is = he is
• Ons is = we are
• Hulle is = they are

So Afrikaans does not switch between am / is / are in the present tense. It just uses is.

Here op means on.

So op die dokument means on the document. It tells you the location of the claim number.

This is the normal choice if something appears physically on a page or on a document.

Sometimes, but it changes the nuance.

• op die dokument suggests something printed or written on the document itself
• in die dokument suggests something contained within the document

In this sentence, op die dokument is the more natural choice if you mean the claim number appears on the actual document.

In Afrikaans, yes/no questions usually put the verb first:

• Is die eisnommer op die dokument?

That means Is the claim number on the document?

This verb-first pattern is very common in Afrikaans questions.

No. Unlike German, Afrikaans does not capitalize all nouns.

So you write:

• die eisnommer
• die dokument

The only reason Die has a capital letter here is that it is the first word of the sentence.

Yes, it is a close cognate. Many English speakers recognize it easily.

The main difference is spelling:

• English: document
• Afrikaans: dokument

So it is a familiar word, just adapted to Afrikaans spelling.