Le livre a cent pages.

No. Here a is the third-person singular form of the verb avoir (to have).

So:

• le livre = the book
• a = has
• cent pages = one hundred pages

French uses avoir just like English uses to have in this kind of sentence:

• Le livre a cent pages. = The book has one hundred pages.

It does not mean is here.

a without an accent is a form of avoir (to have).

• il/elle/on a = he/she/it has

à with an accent is a preposition, usually meaning to, at, or in depending on context.

So:

• Le livre a cent pages. = The book has one hundred pages.
• Le livre est à Marie. = The book belongs to Marie.

This is a very common thing learners mix up, so it is good to notice it early.

French usually needs an article before a singular countable noun.

So livre by itself usually would not work the way book sometimes can in English.

Here, le livre means the book. The article le is the masculine singular definite article.

• le livre = the book
• un livre = a book

If you changed the sentence to Un livre a cent pages, it would mean A book has one hundred pages, which sounds more general or less specific.

Because after a number, French normally puts the noun directly after the number.

So:

• cent pages = one hundred pages
• deux livres = two books
• trois maisons = three houses

You do not say cent de pages here.

French uses de in some quantity expressions, but not with a normal number + noun pattern like this one.

Because the sentence refers to 100 pages, so the noun must be plural.

• une page = one page
• deux pages = two pages
• cent pages = one hundred pages

Just like in English, anything greater than one takes the plural form.

Because cent stays singular when it means exactly 100 and is not multiplied.

So:

• cent pages = 100 pages

But when cent is multiplied, it can take an s:

• deux cents pages = 200 pages

Then it loses the s again if another number follows:

• deux cent un pages = 201 pages

So in your sentence, cent has no s because it is simply 100.

Yes, very close.

The structure is:

• Le livre = subject
• a = verb
• cent pages = object/complement

So it follows the same basic pattern as:

• The book has one hundred pages.

This makes the sentence fairly straightforward for English speakers.

A simple pronunciation guide is:

luh leevr ah sahn pahzh

A few important points:

• le sounds roughly like luh
• livre sounds like leevr
• a sounds like a short open ah
• cent sounds like sahn with a nasal vowel; the t is silent
• pages sounds like pahzh

The final s in pages is not pronounced.

No, normally you do not pronounce a liaison there.

So it is:

• cent pages → sahn pahzh

not something like sahn-t-pahzh.

This is useful because learners often want to pronounce the final t, but in this phrase it stays silent.

Yes. That would mean This book has one hundred pages.

Compare:

• Le livre a cent pages. = The book has one hundred pages.
• Ce livre a cent pages. = This book has one hundred pages.

So the original sentence uses the definite article le, while ce is a demonstrative adjective meaning this or that depending on context.

Yes, it is completely natural and correct.

French commonly uses avoir to talk about how many pages, rooms, children, parts, or features something has:

• La maison a trois chambres. = The house has three bedrooms.
• Le livre a cent pages. = The book has one hundred pages.

So this is a standard, everyday French sentence pattern.