1, 3, 7, 9, 21, 63
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No, 6 is not a factor of 63 because it does not go in evenly.
3 goes into 36 and 63 evenly.
1, 3 and 9.
It is any members of the infinite set of numbers of the form 63*k where k is an integer. Since the set is infinite, it is not possible to list them.
2 can go into 38 and 100 evenly.