Only 1 goes into both of them evenly. You can use -1 if you have to, but we don't generally consider negative numbers as factors.
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no if you multiply two primes for example 7x9=63 63 is not prime because 9 and 7 go into it
1 and 3 can go into 12 and 63.
No.
The only common factor of 16 % 17 is... 1
The number 63 can be evenly divided by 1, 3, 7, 9, 21, and 63.