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.
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The prime factor of 9 is 3. For it to be common, it needs to be compared to another set of prime factors.
Numbers that have no common factor like 8 and 9 as 8=23 and 9=32 The two of them are not prime but they have no common factor
Both 6 and 9 have the number 3 as a prime factor. 6 = 3 x 2 9 = 3 x 3
3 and 9 are factors of 18. 3 is prime, 9 isn't.
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