No, 63 is not prime.
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63 21,3 7,3,3
63 21,3 7,3,3
No, 63 and 74 are not relatively prime because they have a common factor of 1.
It is 7 because the product of its prime factors are: 3*3*7 = 63
The prime factorization of 63 is 3 x 3 x 7.