3 and 7 both are
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No; 3 is a factor of 63.
No, 6 is not a factor of 63 because it does not go in evenly.
The greatest common factor of 27,54 and 63 is 9.
The greatest common factor of the numbers 28, 35 and 63 is 7.
No. 36 is composite and so it cannot be a prime factor.