5 of them.
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999,999,999 numbers less than 1,000,000,000.
They are 239 prime numbers less than 1500.
There are 1229 prime numbers that are less than 10000.
No, because it is dividable by more than 1 and 824. You can also divide it by 2, 4, and other numbers.
There are 25 prime numbers less than 100