Kitap bin sayfa.

Because Turkish often leaves out to be in the present tense, especially in the 3rd person.

So:

• Kitap bin sayfa. = The book is a thousand pages.

There is an understood is/are meaning, but no separate word is needed.

If you want to make the copula more explicit or more formal, you can add -dır:

• Kitap bin sayfadır.

That sounds more formal or written.

In Turkish, nouns usually stay singular after numbers.

So you say:

• bir sayfa = one page
• iki sayfa = two pages
• on sayfa = ten pages
• bin sayfa = a thousand pages

Unlike English, Turkish does not normally say bin sayfalar here.

This is a very important pattern:

• üç kitap = three books
• beş öğrenci = five students
• yirmi yıl = twenty years

Bin means one thousand.

Examples:

• bin sayfa = a thousand pages
• bin lira = a thousand lira
• bin kişi = a thousand people

Turkish numbers are straightforward here, and bin does not need bir before it in normal usage. In fact, bir bin is not standard.

Because kitap is the basic dictionary form, and here it is being used as the subject of the sentence.

• kitap = book
• kitabı = the book / his-her-its book / book as definite object, depending on context
• kitabın = of the book / your book, depending on context

In Kitap bin sayfa, kitap is just the subject: the book / a book, depending on context.

Turkish often does not use a separate word like the or a, so the exact meaning comes from context.

It is understandable, but many speakers would prefer a more explicit version, such as:

• Kitap bin sayfa uzunluğunda. = The book is a thousand pages long.
• Kitap bin sayfalık. = The book is a thousand-page book / The book is a thousand pages long.

So Kitap bin sayfa is short and understandable, but it can sound a little elliptical. In everyday speech, people often use one of the fuller versions above.

The sentence is built like this:

• Kitap = subject
• bin sayfa = predicate phrase

So literally it is something like:

• Book thousand pages.

This is normal in Turkish for simple identity/description sentences. The important descriptive information often comes at the end.

Compare:

• Ev büyük. = The house is big.
• Film çok güzel. = The movie is very good.
• Kitap bin sayfa. = The book is a thousand pages.

Yes, absolutely.

• Bu kitap bin sayfa. = This book is a thousand pages.
• O kitap bin sayfa. = That book is a thousand pages.

Adding bu or o can make the sentence feel more natural if you are talking about a specific book.

You could also say:

• Bu kitap bin sayfalık.
• Bu kitap bin sayfa uzunluğunda.

These often sound more complete.

Good question.

• bin sayfa = a thousand pages
• bin sayfalık = thousand-page, having a length of a thousand pages

So:

• Kitap bin sayfa. = The book is a thousand pages.
• Bin sayfalık bir kitap. = A thousand-page book.
• Kitap bin sayfalık. = The book is a thousand-page book / The book is a thousand pages long.

The ending -lık / -lik / -luk / -lük can turn nouns into an adjective-like form meaning having that amount/quality.

Yes.

• Kitap bin sayfa.
• Kitap bin sayfadır.

Both are possible.

The version with -dır sounds:

• more formal
• more definite
• more like written or careful speech

In everyday conversation, Turkish often leaves it out.

Turkish does not have articles exactly like English a/an and the.

So kitap can mean:

• a book
• the book
• just book in a general sense

The context tells you which meaning is intended.

If Turkish wants to emphasize one, it can use bir:

• bir kitap = a book / one book

But in Kitap bin sayfa, there is no need for bir before kitap.

Often Turkish prefers structures like these:

• Kitap bin sayfa.
• Kitap bin sayfa uzunluğunda.
• Kitap bin sayfalık.

If you want a version closer to has, you can say:

• Kitabın bin sayfası var. = The book has a thousand pages.

This is also very natural. Literally it means something like The book has a thousand pages existing.

So Turkish can express the idea in more than one natural way.