A square of any Prime number, p has exactly three factors. They are 1, p and p^2.
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The square of any prime number has exactly three factors: 22, 32, 52, etc.
I belive it is 4. The factors of 4 are 1,4, and 2.
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
Well, If we looked at this way: (224) = 16777216, so this number has exactly 24 factors. (324) = 282429536481, so this number has exactly 24 factors. (510)(210)(34) = 810000000000, so this number has exactly 24 factors.
A number that has exactly two (positive) factors is called a prime number. For instance, the only factors of 7 are 1 and 7.