The number 2,807,280 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 28 30 35 36 40 42 45 48 56 60 63 70 72 80 84 90 105 112 120 126 140 144 168 180 210 240 252 280 315 336 360 420 504 557 560 630 720 840 1,008 1,114 1,260 1,671 1,680 2,228 2,520 2,785 3,342 3,899 4,456 5,013 5,040 5,570 6,684 7,798 8,355 8,912 10,026 11,140 11,697 13,368 15,596 16,710 19,495 20,052 22,280 23,394 25,065 26,736 31,192 33,420 35,091 38,990 40,104 44,560 46,788 50,130 58,485 62,384 66,840 70,182 77,980 80,208 93,576 100,260 116,970 133,680 140,364 155,960 175,455 187,152 200,520 233,940 280,728 311,920 350,910 401,040 467,880 561,456 701,820 935,760 1,403,640 and 2,807,280, with no remainder.
Since 2,807,280 cannot be divided by just 1 and 2,807,280, it is a composite number.