The number 516,600 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 18 20 21 24 25 28 30 35 36 40 41 42 45 50 56 60 63 70 72 75 82 84 90 100 105 120 123 126 140 150 164 168 175 180 200 205 210 225 246 252 280 287 300 315 328 350 360 369 410 420 450 492 504 525 574 600 615 630 700 738 820 840 861 900 984 1,025 1,050 1,148 1,230 1,260 1,400 1,435 1,476 1,575 1,640 1,722 1,800 1,845 2,050 2,100 2,296 2,460 2,520 2,583 2,870 2,952 3,075 3,150 3,444 3,690 4,100 4,200 4,305 4,920 5,166 5,740 6,150 6,300 6,888 7,175 7,380 8,200 8,610 9,225 10,332 11,480 12,300 12,600 12,915 14,350 14,760 17,220 18,450 20,664 21,525 24,600 25,830 28,700 34,440 36,900 43,050 51,660 57,400 64,575 73,800 86,100 103,320 129,150 172,200 258,300 and 516,600, with no remainder.
Since 516,600 cannot be divided by just 1 and 516,600, it is a composite number.