The number 4,319,840 can be evenly divided by 1 2 4 5 7 8 10 14 16 19 20 28 29 32 35 38 40 49 56 58 70 76 80 95 98 112 116 133 140 145 152 160 190 196 203 224 232 245 266 280 290 304 380 392 406 464 490 532 551 560 580 608 665 760 784 812 928 931 980 1,015 1,064 1,102 1,120 1,160 1,330 1,421 1,520 1,568 1,624 1,862 1,960 2,030 2,128 2,204 2,320 2,660 2,755 2,842 3,040 3,248 3,724 3,857 3,920 4,060 4,256 4,408 4,640 4,655 5,320 5,510 5,684 6,496 7,105 7,448 7,714 7,840 8,120 8,816 9,310 10,640 11,020 11,368 14,210 14,896 15,428 16,240 17,632 18,620 19,285 21,280 22,040 22,736 26,999 28,420 29,792 30,856 32,480 37,240 38,570 44,080 45,472 53,998 56,840 61,712 74,480 77,140 88,160 107,996 113,680 123,424 134,995 148,960 154,280 215,992 227,360 269,990 308,560 431,984 539,980 617,120 863,968 1,079,960 2,159,920 and 4,319,840, with no remainder.
Since 4,319,840 cannot be divided by just 1 and 4,319,840, it is a composite number.