The number 654,360 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 19 20 21 24 28 30 35 38 40 41 42 56 57 60 70 76 82 84 95 105 114 120 123 133 140 152 164 168 190 205 210 228 246 266 280 285 287 328 380 399 410 420 456 492 532 570 574 615 665 760 779 798 820 840 861 984 1,064 1,140 1,148 1,230 1,330 1,435 1,558 1,596 1,640 1,722 1,995 2,280 2,296 2,337 2,460 2,660 2,870 3,116 3,192 3,444 3,895 3,990 4,305 4,674 4,920 5,320 5,453 5,740 6,232 6,888 7,790 7,980 8,610 9,348 10,906 11,480 11,685 15,580 15,960 16,359 17,220 18,696 21,812 23,370 27,265 31,160 32,718 34,440 43,624 46,740 54,530 65,436 81,795 93,480 109,060 130,872 163,590 218,120 327,180 and 654,360, with no remainder.
Since 654,360 cannot be divided by just 1 and 654,360, it is a composite number.