The number 1,254,240 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 16 18 20 24 26 30 32 36 39 40 45 48 52 60 65 67 72 78 80 90 96 104 117 120 130 134 144 156 160 180 195 201 208 234 240 260 268 288 312 335 360 390 402 416 468 480 520 536 585 603 624 670 720 780 804 871 936 1,005 1,040 1,072 1,170 1,206 1,248 1,340 1,440 1,560 1,608 1,742 1,872 2,010 2,080 2,144 2,340 2,412 2,613 2,680 3,015 3,120 3,216 3,484 3,744 4,020 4,355 4,680 4,824 5,226 5,360 6,030 6,240 6,432 6,968 7,839 8,040 8,710 9,360 9,648 10,452 10,720 12,060 13,065 13,936 15,678 16,080 17,420 18,720 19,296 20,904 24,120 26,130 27,872 31,356 32,160 34,840 39,195 41,808 48,240 52,260 62,712 69,680 78,390 83,616 96,480 104,520 125,424 139,360 156,780 209,040 250,848 313,560 418,080 627,120 and 1,254,240, with no remainder.
Since 1,254,240 cannot be divided by just 1 and 1,254,240, it is a composite number.