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I know how many people were at Hogwarts, but I don't know how many rooms are there totally.

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    How many of what kind of rooms? Do you mean all the rooms in the castle, just the dormitories... you’ll need to be more specific to have a question that can be answered.
    – Obsidia
    Apr 4 '18 at 2:46
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An indeterminate number

Hogwarts is a magical castle with stairs and hallways that rearrange themselves and at least one room that is documented to vanish when not needed (the Room of Requirement), and quite possibly more.

Also, Rowling is notoriously terrible with math (especially population math) and has said that she deliberately instituted the fluid architecture so that she didn't have to worry about where things were. In other words, she specifically designed Hogwarts to avoid having to answer this question (among others).

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