The number 3,109,600 can be evenly divided by 1 2 4 5 8 10 13 16 20 23 25 26 32 40 46 50 52 65 80 92 100 104 115 130 160 169 184 200 208 230 260 299 325 338 368 400 416 460 520 575 598 650 676 736 800 845 920 1,040 1,150 1,196 1,300 1,352 1,495 1,690 1,840 2,080 2,300 2,392 2,600 2,704 2,990 3,380 3,680 3,887 4,225 4,600 4,784 5,200 5,408 5,980 6,760 7,475 7,774 8,450 9,200 9,568 10,400 11,960 13,520 14,950 15,548 16,900 18,400 19,435 23,920 27,040 29,900 31,096 33,800 38,870 47,840 59,800 62,192 67,600 77,740 97,175 119,600 124,384 135,200 155,480 194,350 239,200 310,960 388,700 621,920 777,400 1,554,800 and 3,109,600, with no remainder.
Since 3,109,600 cannot be divided by just 1 and 3,109,600, it is a composite number.