The number 1,689,120 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 17 18 20 23 24 27 30 32 34 36 40 45 46 48 51 54 60 68 69 72 80 85 90 92 96 102 108 115 120 135 136 138 144 153 160 170 180 184 204 207 216 230 240 255 270 272 276 288 306 340 345 360 368 391 408 414 432 459 460 480 510 540 544 552 612 621 680 690 720 736 765 782 816 828 864 918 920 1,020 1,035 1,080 1,104 1,173 1,224 1,242 1,360 1,380 1,440 1,530 1,564 1,632 1,656 1,836 1,840 1,955 2,040 2,070 2,160 2,208 2,295 2,346 2,448 2,484 2,720 2,760 3,060 3,105 3,128 3,312 3,519 3,672 3,680 3,910 4,080 4,140 4,320 4,590 4,692 4,896 4,968 5,520 5,865 6,120 6,210 6,256 6,624 7,038 7,344 7,820 8,160 8,280 9,180 9,384 9,936 10,557 11,040 11,730 12,240 12,420 12,512 14,076 14,688 15,640 16,560 17,595 18,360 18,768 19,872 21,114 23,460 24,480 24,840 28,152 31,280 33,120 35,190 36,720 37,536 42,228 46,920 49,680 52,785 56,304 62,560 70,380 73,440 84,456 93,840 99,360 105,570 112,608 140,760 168,912 187,680 211,140 281,520 337,824 422,280 563,040 844,560 and 1,689,120, with no remainder.
Since 1,689,120 cannot be divided by just 1 and 1,689,120, it is a composite number.