The number 843,600 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 19 20 24 25 30 37 38 40 48 50 57 60 74 75 76 80 95 100 111 114 120 148 150 152 185 190 200 222 228 240 285 296 300 304 370 380 400 444 456 475 555 570 592 600 703 740 760 888 912 925 950 1,110 1,140 1,200 1,406 1,425 1,480 1,520 1,776 1,850 1,900 2,109 2,220 2,280 2,775 2,812 2,850 2,960 3,515 3,700 3,800 4,218 4,440 4,560 5,550 5,624 5,700 7,030 7,400 7,600 8,436 8,880 10,545 11,100 11,248 11,400 14,060 14,800 16,872 17,575 21,090 22,200 22,800 28,120 33,744 35,150 42,180 44,400 52,725 56,240 70,300 84,360 105,450 140,600 168,720 210,900 281,200 421,800 and 843,600, with no remainder.
Since 843,600 cannot be divided by just 1 and 843,600, it is a composite number.