The number 2,239,440 can be evenly divided by 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 31 35 40 42 43 48 56 60 62 70 80 84 86 93 105 112 120 124 129 140 155 168 172 186 210 215 217 240 248 258 280 301 310 336 344 372 420 430 434 465 496 516 560 602 620 645 651 688 744 840 860 868 903 930 1,032 1,085 1,204 1,240 1,290 1,302 1,333 1,488 1,505 1,680 1,720 1,736 1,806 1,860 2,064 2,170 2,408 2,480 2,580 2,604 2,666 3,010 3,255 3,440 3,472 3,612 3,720 3,999 4,340 4,515 4,816 5,160 5,208 5,332 6,020 6,510 6,665 7,224 7,440 7,998 8,680 9,030 9,331 10,320 10,416 10,664 12,040 13,020 13,330 14,448 15,996 17,360 18,060 18,662 19,995 21,328 24,080 26,040 26,660 27,993 31,992 36,120 37,324 39,990 46,655 52,080 53,320 55,986 63,984 72,240 74,648 79,980 93,310 106,640 111,972 139,965 149,296 159,960 186,620 223,944 279,930 319,920 373,240 447,888 559,860 746,480 1,119,720 and 2,239,440, with no remainder.
Since 2,239,440 cannot be divided by just 1 and 2,239,440, it is a composite number.