The number 2,235,840 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 17 20 24 30 32 34 40 48 51 60 64 68 80 85 96 102 120 136 137 160 170 192 204 240 255 272 274 320 340 408 411 480 510 544 548 680 685 816 822 960 1,020 1,088 1,096 1,360 1,370 1,632 1,644 2,040 2,055 2,192 2,329 2,720 2,740 3,264 3,288 4,080 4,110 4,384 4,658 5,440 5,480 6,576 6,987 8,160 8,220 8,768 9,316 10,960 11,645 13,152 13,974 16,320 16,440 18,632 21,920 23,290 26,304 27,948 32,880 34,935 37,264 43,840 46,580 55,896 65,760 69,870 74,528 93,160 111,792 131,520 139,740 149,056 186,320 223,584 279,480 372,640 447,168 558,960 745,280 1,117,920 and 2,235,840, with no remainder.
Since 2,235,840 cannot be divided by just 1 and 2,235,840, it is a composite number.