The number 3,238,200 can be evenly divided by 1 2 3 4 5 6 7 8 9 10 12 14 15 18 20 21 24 25 28 30 35 36 40 42 45 50 56 60 63 70 72 75 84 90 100 105 120 126 140 150 168 175 180 200 210 225 252 257 280 300 315 350 360 420 450 504 514 525 600 630 700 771 840 900 1,028 1,050 1,260 1,285 1,400 1,542 1,575 1,799 1,800 2,056 2,100 2,313 2,520 2,570 3,084 3,150 3,598 3,855 4,200 4,626 5,140 5,397 6,168 6,300 6,425 7,196 7,710 8,995 9,252 10,280 10,794 11,565 12,600 12,850 14,392 15,420 16,191 17,990 18,504 19,275 21,588 23,130 25,700 26,985 30,840 32,382 35,980 38,550 43,176 44,975 46,260 51,400 53,970 57,825 64,764 71,960 77,100 80,955 89,950 92,520 107,940 115,650 129,528 134,925 154,200 161,910 179,900 215,880 231,300 269,850 323,820 359,800 404,775 462,600 539,700 647,640 809,550 1,079,400 1,619,100 and 3,238,200, with no remainder.
Since 3,238,200 cannot be divided by just 1 and 3,238,200, it is a composite number.