16 = 25
2 is the only prime factor of 16
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15 is not a prime number, so it can't be a prime factor.
16 8,2 4,2,2 2,2,2,2
That is a very good question. The awnser is quite simple, its a number.
16=2*2*2*2 There is only one distinct prime factor, that is 2.