Whole numbers have prime factors, not fractions.
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27 has only one prime factor: 3
9 is not a prime factor, but it does have one prime factor, which is three. Prime factors are factors of a number that are prime.
One with one prime factor and one other factor ...or it might be one with two factors both of which are prime...
By definition, all prime numbers have exactly two factors. There is not a prime number that has only one factor.
A prime number has only one prime factor, and that prime factor is the number itself.