The number 4,280,400 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 29 30 36 40 41 45 48 50 58 60 72 75 80 82 87 90 100 116 120 123 144 145 150 164 174 180 200 205 225 232 240 246 261 290 300 328 348 360 369 400 410 435 450 464 492 522 580 600 615 656 696 720 725 738 820 870 900 984 1,025 1,044 1,160 1,189 1,200 1,230 1,305 1,392 1,450 1,476 1,640 1,740 1,800 1,845 1,968 2,050 2,088 2,175 2,320 2,378 2,460 2,610 2,900 2,952 3,075 3,280 3,480 3,567 3,600 3,690 4,100 4,176 4,350 4,756 4,920 5,220 5,800 5,904 5,945 6,150 6,525 6,960 7,134 7,380 8,200 8,700 9,225 9,512 9,840 10,440 10,701 11,600 11,890 12,300 13,050 14,268 14,760 16,400 17,400 17,835 18,450 19,024 20,880 21,402 23,780 24,600 26,100 28,536 29,520 29,725 34,800 35,670 36,900 42,804 47,560 49,200 52,200 53,505 57,072 59,450 71,340 73,800 85,608 89,175 95,120 104,400 107,010 118,900 142,680 147,600 171,216 178,350 214,020 237,800 267,525 285,360 356,700 428,040 475,600 535,050 713,400 856,080 1,070,100 1,426,800 2,140,200 and 4,280,400, with no remainder.
Since 4,280,400 cannot be divided by just 1 and 4,280,400, it is a composite number.