The number 3,115,200 can be evenly divided by 1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 25 30 32 33 40 44 48 50 55 59 60 64 66 75 80 88 96 100 110 118 120 132 150 160 165 176 177 192 200 220 236 240 264 275 295 300 320 330 352 354 400 440 472 480 528 550 590 600 649 660 704 708 800 825 880 885 944 960 1,056 1,100 1,180 1,200 1,298 1,320 1,416 1,475 1,600 1,650 1,760 1,770 1,888 1,947 2,112 2,200 2,360 2,400 2,596 2,640 2,832 2,950 3,245 3,300 3,520 3,540 3,776 3,894 4,400 4,425 4,720 4,800 5,192 5,280 5,664 5,900 6,490 6,600 7,080 7,788 8,800 8,850 9,440 9,735 10,384 10,560 11,328 11,800 12,980 13,200 14,160 15,576 16,225 17,600 17,700 18,880 19,470 20,768 23,600 25,960 26,400 28,320 31,152 32,450 35,400 38,940 41,536 47,200 48,675 51,920 52,800 56,640 62,304 64,900 70,800 77,880 94,400 97,350 103,840 124,608 129,800 141,600 155,760 194,700 207,680 259,600 283,200 311,520 389,400 519,200 623,040 778,800 1,038,400 1,557,600 and 3,115,200, with no remainder.
Since 3,115,200 cannot be divided by just 1 and 3,115,200, it is a composite number.