what
how many
many; a lot of
several; a few; some
「何」 has another reading with different meanings.
how many months
many times over; often; repeatedly; time after time
for many days; for several days
some days; several days
何でそんなことしたの?
Why did you do something like that?
兄弟は何人いるんだよ。
So how many siblings do you have?
何と言えばいいか分からない。
I don't know what to say.