The number 2,140,320 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 13 14 15 16 20 21 24 26 28 30 32 35 39 40 42 48 49 52 56 60 65 70 78 80 84 91 96 98 104 105 112 120 130 140 147 156 160 168 182 195 196 208 210 224 240 245 260 273 280 294 312 336 343 364 390 392 416 420 455 480 490 520 546 560 588 624 637 672 686 728 735 780 784 840 910 980 1,029 1,040 1,092 1,120 1,176 1,248 1,274 1,365 1,372 1,456 1,470 1,560 1,568 1,680 1,715 1,820 1,911 1,960 2,058 2,080 2,184 2,352 2,548 2,730 2,744 2,912 2,940 3,120 3,185 3,360 3,430 3,640 3,822 3,920 4,116 4,368 4,459 4,704 5,096 5,145 5,460 5,488 5,880 6,240 6,370 6,860 7,280 7,644 7,840 8,232 8,736 8,918 9,555 10,192 10,290 10,920 10,976 11,760 12,740 13,377 13,720 14,560 15,288 16,464 17,836 19,110 20,384 20,580 21,840 22,295 23,520 25,480 26,754 27,440 30,576 32,928 35,672 38,220 41,160 43,680 44,590 50,960 53,508 54,880 61,152 66,885 71,344 76,440 82,320 89,180 101,920 107,016 133,770 142,688 152,880 164,640 178,360 214,032 267,540 305,760 356,720 428,064 535,080 713,440 1,070,160 and 2,140,320, with no remainder.
Since 2,140,320 cannot be divided by just 1 and 2,140,320, it is a composite number.