The number 652,800 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 17 20 24 25 30 32 34 40 48 50 51 60 64 68 75 80 85 96 100 102 120 128 136 150 160 170 192 200 204 240 255 256 272 300 320 340 384 400 408 425 480 510 512 544 600 640 680 768 800 816 850 960 1,020 1,088 1,200 1,275 1,280 1,360 1,536 1,600 1,632 1,700 1,920 2,040 2,176 2,400 2,550 2,560 2,720 3,200 3,264 3,400 3,840 4,080 4,352 4,800 5,100 5,440 6,400 6,528 6,800 7,680 8,160 8,704 9,600 10,200 10,880 12,800 13,056 13,600 16,320 19,200 20,400 21,760 26,112 27,200 32,640 38,400 40,800 43,520 54,400 65,280 81,600 108,800 130,560 163,200 217,600 326,400 and 652,800, with no remainder.
Since 652,800 cannot be divided by just 1 and 652,800, it is a composite number.