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