The number 8,006,400 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 25 30 32 36 40 45 48 50 60 64 72 75 80 90 96 100 120 128 139 144 150 160 180 192 200 225 240 256 278 288 300 320 360 384 400 417 450 480 556 576 600 640 695 720 768 800 834 900 960 1,112 1,152 1,200 1,251 1,280 1,390 1,440 1,600 1,668 1,800 1,920 2,085 2,224 2,304 2,400 2,502 2,780 2,880 3,200 3,336 3,475 3,600 3,840 4,170 4,448 4,800 5,004 5,560 5,760 6,255 6,400 6,672 6,950 7,200 8,340 8,896 9,600 10,008 10,425 11,120 11,520 12,510 13,344 13,900 14,400 16,680 17,792 19,200 20,016 20,850 22,240 25,020 26,688 27,800 28,800 31,275 33,360 35,584 40,032 41,700 44,480 50,040 53,376 55,600 57,600 62,550 66,720 80,064 83,400 88,960 100,080 106,752 111,200 125,100 133,440 160,128 166,800 177,920 200,160 222,400 250,200 266,880 320,256 333,600 400,320 444,800 500,400 533,760 667,200 800,640 889,600 1,000,800 1,334,400 1,601,280 2,001,600 2,668,800 4,003,200 and 8,006,400, with no remainder.
Since 8,006,400 cannot be divided by just 1 and 8,006,400, it is a composite number.