Le livre a mille pages.

A is the third-person singular present of avoir (to have).

So Le livre a mille pages is literally The book has a thousand pages.

French commonly uses avoir to say that something contains a certain number of parts, like pages, rooms, chapters, or inhabitants.

Examples:

• Le livre a 300 pages. = The book has 300 pages.
• La maison a six pièces. = The house has six rooms.

No. They are different words, even though they are pronounced the same.

• a = has (from avoir)
• à = a preposition meaning to, at, in, etc.

In this sentence, a is correct because the sentence needs a verb:

• Le livre a mille pages. = The book has a thousand pages.

If you wrote à here, the sentence would be ungrammatical.

Le means the, while un means a or an.

So:

• Le livre = the book
• Un livre = a book

You use le when you mean a specific book, or a book already known from context.

If you said Un livre a mille pages, that would mean A book has a thousand pages, which sounds less natural unless you are talking about one unspecified book.

You can tell from the article le.

• le livre = masculine singular
• la page = feminine singular

In French, every noun has grammatical gender, so you usually learn the noun together with its article:

• le livre
• la page

That is the safest habit for learners.

In French, 1000 is normally just mille, not un mille.

So:

• 1000 = mille
• 2000 = deux mille
• 3000 = trois mille

This is different from million:

• un million
• deux millions

So you say:

• mille pages not
• un mille pages

As a number, mille is invariable, which means it does not change in the plural.

So you write:

• mille
• deux mille
• dix mille

not

• milles
• deux milles

A different word, millier (a thousand, a group of about a thousand), can change:

• des milliers de personnes = thousands of people

But the number mille itself stays the same.

Because the quantity is more than one.

In French, just like in English, a countable noun normally becomes plural after numbers greater than one:

• une page
• deux pages
• mille pages

So:

• page = singular
• pages = plural

Also, the final s in pages is normally not pronounced.

Because after ordinary numbers, French usually puts the noun directly after the number:

• trois pages
• cent pages
• mille pages

So mille pages is correct.

This is useful to compare with expressions that do use de:

• beaucoup de pages
• un million de pages

Why the difference? Because million behaves like a noun, while mille behaves like a basic number word.

So:

• mille pages
• un million de pages

A good pronunciation guide is:

lə livʁ a mil paʒ

A rough English-style approximation would be: luh leevr ah meel pahzh

A few details:

• le sounds like luh
• livre ends with a French r
• a sounds like ah
• mille sounds like meel
• pages sounds like pahzh
• the final s in pages is silent

Yes. That is also very natural French.

• Ce livre a mille pages. = This book has a thousand pages.
• Ce livre fait mille pages. = This book is a thousand pages long / This book runs to a thousand pages.

French often uses faire for measurements, size, length, and similar ideas.

So both are correct, but the nuance is slightly different:

• a mille pages focuses on what the book has
• fait mille pages focuses on the book’s length/extent