The number 730,620 can be evenly divided by 1 2 3 4 5 6 9 10 11 12 15 18 20 22 27 30 33 36 41 44 45 54 55 60 66 81 82 90 99 108 110 123 132 135 162 164 165 180 198 205 220 246 270 297 324 330 369 396 405 410 451 492 495 540 594 615 660 738 810 820 891 902 990 1,107 1,188 1,230 1,353 1,476 1,485 1,620 1,782 1,804 1,845 1,980 2,214 2,255 2,460 2,706 2,970 3,321 3,564 3,690 4,059 4,428 4,455 4,510 5,412 5,535 5,940 6,642 6,765 7,380 8,118 8,910 9,020 11,070 12,177 13,284 13,530 16,236 16,605 17,820 20,295 22,140 24,354 27,060 33,210 36,531 40,590 48,708 60,885 66,420 73,062 81,180 121,770 146,124 182,655 243,540 365,310 and 730,620, with no remainder.
Since 730,620 cannot be divided by just 1 and 730,620, it is a composite number.