The number 729,600 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 19 20 24 25 30 32 38 40 48 50 57 60 64 75 76 80 95 96 100 114 120 128 150 152 160 190 192 200 228 240 256 285 300 304 320 380 384 400 456 475 480 512 570 600 608 640 760 768 800 912 950 960 1,140 1,200 1,216 1,280 1,425 1,520 1,536 1,600 1,824 1,900 1,920 2,280 2,400 2,432 2,560 2,850 3,040 3,200 3,648 3,800 3,840 4,560 4,800 4,864 5,700 6,080 6,400 7,296 7,600 7,680 9,120 9,600 9,728 11,400 12,160 12,800 14,592 15,200 18,240 19,200 22,800 24,320 29,184 30,400 36,480 38,400 45,600 48,640 60,800 72,960 91,200 121,600 145,920 182,400 243,200 364,800 and 729,600, with no remainder.
Since 729,600 cannot be divided by just 1 and 729,600, it is a composite number.