No neither of them are because 3x3=9 so it is not prime. 8 is not either because 2x4=8
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Yes, they are relatively prime.
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.