The only common factor is 1, so yes 4 and 9 are co-prime.
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There is not a specific name. They need not be coprime since 2 is not in the 4 times table but 2 and 4 are non coprime.
No. If two numbers are coprime, they must have no common factors.
1. The two numbers are coprime.
1. The two numbers are coprime.
are co-prime