1 x 143
11 x 13
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143
If a number has equal factors, it is a perfect square and the equal factors would be square roots.
The composite factors of 63 are 9, 21 and 63.
The factors of 121 are 1, 11, 121 The factors of 280 are 1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280
16 and -5