The prime factor of 9 is 3. For it to be common, it needs to be compared to another set of prime factors.
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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
To be relatively prime, it would have to be compared to another number. When it is, if the GCF, or greatest common factor is 1, then it is relatively prime. 45 and 9 = NO because they have 9 in common. 45 and 31 = Yes because they only have 1 as a common factor.
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.
it is 9.
1 because 13 is a prime number.