1, 3, 7, 9, 21, 63.
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It is: 1
It is: 7 and 1
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.
The number 63 can be evenly divided by 1, 3, 7, 9, 21, and 63.
63 is divided evenly by these numbers: 1, 3, 7, 9, 21, 63.