Any two numbers who are relatively prime will work
So look at 9 and 4. Neither is prime and their GCD is 1.
You must need two numbers with NO other factors in common.
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52 is composite. You need at least two numbers to find a GCF.
Prime numbers have two factors, composite numbers have more than two.
Composite numbers have more than two factors. Once you find a third factor, you know your number is composite.
Prime numbers have two factors; composite numbers have more than two.