Verified answer

11 - простое число

1001 = 7 * 11 * 13

1225 = 5 * 5 * 7 * 7

21780 = 2 * 2 * 3 * 3 * 5 * 11 * 11

45630 = 2 * 3 * 3 * 3 * 5 * 13 * 13