9 is prime.
6 is not because it can be multiplied by 3 and 2 as well as 6 and 1.
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No.
You might be thinking of relatively prime numbers. Two numbers are considered relatively prime if their GCF is 1. 4 and 9 are relatively prime.
Not necessarily. 4 and 9 are relatively prime and both are composite.
Two numbers are considered relatively prime when their GCF is 1. 4 and 9 are relatively prime.
Numbers are considered relatively prime if they have no prime factors in common, that is, that their GCF is 1. 4 and 9 are relatively prime.