25, among others.
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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.
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.
Any prime number is relatively prime to any other prime number.
It can be. 16 is relatively prime with 25.
Two numbers are relatively prime if they have no factor in common. But a single number cannot be relatively prime.