Factors are numbers you can multiply together to get another number.
21: (1, 21) (3, 7)
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Factors of 21 are 1, 3, 7, and 21; the factor pairs are (1 x 21) and (3 x 7).
There are 3 factor pairs of 63: 63 = 1 x 63 63 = 3 x 21 63 = 7 x 9
1 x 21, 3 x 7, 7 x 3, 21 x 1
1 and 189, 3 and 63, 7 and 27, 9 and 21
(1, 63) (3, 21) (7, 9)