The number 5,178,600 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 18 20 21 24 25 27 28 30 35 36 40 42 45 50 54 56 60 63 70 72 75 84 90 100 105 108 120 126 135 137 140 150 168 175 180 189 200 210 216 225 252 270 274 280 300 315 350 360 378 411 420 450 504 525 540 548 600 630 675 685 700 756 822 840 900 945 959 1,050 1,080 1,096 1,233 1,260 1,350 1,370 1,400 1,512 1,575 1,644 1,800 1,890 1,918 2,055 2,100 2,466 2,520 2,700 2,740 2,877 3,150 3,288 3,425 3,699 3,780 3,836 4,110 4,200 4,725 4,795 4,932 5,400 5,480 5,754 6,165 6,300 6,850 7,398 7,560 7,672 8,220 8,631 9,450 9,590 9,864 10,275 11,508 12,330 12,600 13,700 14,385 14,796 16,440 17,262 18,495 18,900 19,180 20,550 23,016 23,975 24,660 25,893 27,400 28,770 29,592 30,825 34,524 36,990 37,800 38,360 41,100 43,155 47,950 49,320 51,786 57,540 61,650 69,048 71,925 73,980 82,200 86,310 92,475 95,900 103,572 115,080 123,300 129,465 143,850 147,960 172,620 184,950 191,800 207,144 215,775 246,600 258,930 287,700 345,240 369,900 431,550 517,860 575,400 647,325 739,800 863,100 1,035,720 1,294,650 1,726,200 2,589,300 and 5,178,600, with no remainder.
Since 5,178,600 cannot be divided by just 1 and 5,178,600, it is a composite number.