The number 8,637,300 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 25 27 28 30 35 36 42 45 50 54 60 63 70 75 84 90 100 105 108 126 135 140 150 175 180 189 210 225 252 270 300 315 350 378 420 450 457 525 540 630 675 700 756 900 914 945 1,050 1,260 1,350 1,371 1,575 1,828 1,890 2,100 2,285 2,700 2,742 3,150 3,199 3,780 4,113 4,570 4,725 5,484 6,300 6,398 6,855 8,226 9,140 9,450 9,597 11,425 12,339 12,796 13,710 15,995 16,452 18,900 19,194 20,565 22,850 24,678 27,420 28,791 31,990 34,275 38,388 41,130 45,700 47,985 49,356 57,582 61,695 63,980 68,550 79,975 82,260 86,373 95,970 102,825 115,164 123,390 137,100 143,955 159,950 172,746 191,940 205,650 239,925 246,780 287,910 308,475 319,900 345,492 411,300 431,865 479,850 575,820 616,950 719,775 863,730 959,700 1,233,900 1,439,550 1,727,460 2,159,325 2,879,100 4,318,650 and 8,637,300, with no remainder.
Since 8,637,300 cannot be divided by just 1 and 8,637,300, it is a composite number.