1, 3, 7, 9, 21, 49, 63, 147, 441: 1 x 441, 3 x 147, 7 x 63, 9 x 49, 21 x 21.
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Each of these factor pairs (multiply the numbers in parentheses) equals 441: (1, 441) (3, 147) (7, 63) (9, 49) (21, 21)
The prime factorization of 441 is 3 x 3 x 7 x 7
The numbers are 21 and 24. 576 - 441 = 135
The least common multiple of these numbers is 441.
42240 is not prime because it can go into other numbers besides 1 and 42240.