The number 1,249,560 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 27 30 36 39 40 45 52 54 60 65 72 78 89 90 104 108 117 120 130 135 156 178 180 195 216 234 260 267 270 312 351 356 360 390 445 468 520 534 540 585 702 712 780 801 890 936 1,068 1,080 1,157 1,170 1,335 1,404 1,560 1,602 1,755 1,780 2,136 2,314 2,340 2,403 2,670 2,808 3,204 3,471 3,510 3,560 4,005 4,628 4,680 4,806 5,340 5,785 6,408 6,942 7,020 8,010 9,256 9,612 10,413 10,680 11,570 12,015 13,884 14,040 16,020 17,355 19,224 20,826 23,140 24,030 27,768 31,239 32,040 34,710 41,652 46,280 48,060 52,065 62,478 69,420 83,304 96,120 104,130 124,956 138,840 156,195 208,260 249,912 312,390 416,520 624,780 and 1,249,560, with no remainder.
Since 1,249,560 cannot be divided by just 1 and 1,249,560, it is a composite number.