The factors of 123123 are:
1, 3, 7, 11, 13, 21, 33, 39, 41, 77, 91, 123, 143, 231, 273, 287, 429, 451, 533, 861, 1001, 1353, 1599, 3003, 3157, 3731, 5863, 9471, 11193, 17589, 41041, 123123
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A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 123123 is composite.
123,123 = (1 x 105) + (2 x 104) + (3 x 103) + (1 x 102) + (2 x 101) + (3 x 100)
factors: 1, 3, 53, 159prime factors: 3, 53
factors: 1, 5, 103, 515prime factors: 5, 1031x5155x103
factors: 1, 2, 251, 502prime factors: 2, 251