The number 3,021,200 can be evenly divided by 1 2 4 5 7 8 10 13 14 16 20 25 26 28 35 40 50 52 56 65 70 80 83 91 100 104 112 130 140 166 175 182 200 208 260 280 325 332 350 364 400 415 455 520 560 581 650 664 700 728 830 910 1,040 1,079 1,162 1,300 1,328 1,400 1,456 1,660 1,820 2,075 2,158 2,275 2,324 2,600 2,800 2,905 3,320 3,640 4,150 4,316 4,550 4,648 5,200 5,395 5,810 6,640 7,280 7,553 8,300 8,632 9,100 9,296 10,790 11,620 14,525 15,106 16,600 17,264 18,200 21,580 23,240 26,975 29,050 30,212 33,200 36,400 37,765 43,160 46,480 53,950 58,100 60,424 75,530 86,320 107,900 116,200 120,848 151,060 188,825 215,800 232,400 302,120 377,650 431,600 604,240 755,300 1,510,600 and 3,021,200, with no remainder.
Since 3,021,200 cannot be divided by just 1 and 3,021,200, it is a composite number.