8 (1,2,4,8)
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No, a prime number has exactly two factors: 1 and itself.
I belive it is 4. The factors of 4 are 1,4, and 2.
9409
I think that it is 4
Any number of the form a*b^4 where a and b are different prime numbers, or c^9 where c is a prime, will have exactly 10 factors.