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3 times 7 equal to 21 and 3 times 4 equal to 12 the prime factor is 7
12 is a composite number, not a prime factor.
They are not relatively prime. To be relatively prime, the only common factor they could have would be the number 1. Both also have the number 3 as a common factor, so they are not relatively prime.
Either or both. 12 is a factor of 24. 12 is a multiple of 6. 12 is both a factor and a multiple of itself.
All numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors. If the factor is a prime number, it is a common prime factor. 3 is a prime number. 3 is a factor of 9. 3 is a factor of 12. 3 is a common prime factor of 9 and 12.
The prime factorization of 12 is 2 x 2 x 3