The number 1,624,320 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 47 48 54 60 64 72 80 90 94 96 108 120 128 135 141 144 160 180 188 192 216 235 240 256 270 282 288 320 360 376 384 423 432 470 480 540 564 576 640 705 720 752 768 846 864 940 960 1,080 1,128 1,152 1,269 1,280 1,410 1,440 1,504 1,692 1,728 1,880 1,920 2,115 2,160 2,256 2,304 2,538 2,820 2,880 3,008 3,384 3,456 3,760 3,840 4,230 4,320 4,512 5,076 5,640 5,760 6,016 6,345 6,768 6,912 7,520 8,460 8,640 9,024 10,152 11,280 11,520 12,032 12,690 13,536 15,040 16,920 17,280 18,048 20,304 22,560 25,380 27,072 30,080 33,840 34,560 36,096 40,608 45,120 50,760 54,144 60,160 67,680 81,216 90,240 101,520 108,288 135,360 162,432 180,480 203,040 270,720 324,864 406,080 541,440 812,160 and 1,624,320, with no remainder.
Since 1,624,320 cannot be divided by just 1 and 1,624,320, it is a composite number.