The number 1,870,680 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 17 20 21 24 28 30 34 35 40 42 51 56 60 68 70 84 85 102 105 119 120 131 136 140 168 170 204 210 238 255 262 280 340 357 393 408 420 476 510 524 595 655 680 714 786 840 917 952 1,020 1,048 1,190 1,310 1,428 1,572 1,785 1,834 1,965 2,040 2,227 2,380 2,620 2,751 2,856 3,144 3,570 3,668 3,930 4,454 4,585 4,760 5,240 5,502 6,681 7,140 7,336 7,860 8,908 9,170 11,004 11,135 13,362 13,755 14,280 15,589 15,720 17,816 18,340 22,008 22,270 26,724 27,510 31,178 33,405 36,680 44,540 46,767 53,448 55,020 62,356 66,810 77,945 89,080 93,534 110,040 124,712 133,620 155,890 187,068 233,835 267,240 311,780 374,136 467,670 623,560 935,340 and 1,870,680, with no remainder.
Since 1,870,680 cannot be divided by just 1 and 1,870,680, it is a composite number.