The number 1,839,240 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 27 30 36 39 40 45 52 54 60 65 72 78 90 104 108 117 120 130 131 135 156 180 195 216 234 260 262 270 312 351 360 390 393 468 520 524 540 585 655 702 780 786 936 1,048 1,080 1,170 1,179 1,310 1,404 1,560 1,572 1,703 1,755 1,965 2,340 2,358 2,620 2,808 3,144 3,406 3,510 3,537 3,930 4,680 4,716 5,109 5,240 5,895 6,812 7,020 7,074 7,860 8,515 9,432 10,218 11,790 13,624 14,040 14,148 15,327 15,720 17,030 17,685 20,436 23,580 25,545 28,296 30,654 34,060 35,370 40,872 45,981 47,160 51,090 61,308 68,120 70,740 76,635 91,962 102,180 122,616 141,480 153,270 183,924 204,360 229,905 306,540 367,848 459,810 613,080 919,620 and 1,839,240, with no remainder.
Since 1,839,240 cannot be divided by just 1 and 1,839,240, it is a composite number.