The number 1,226,880 can be evenly divided by 1 2 3 4 5 6 8 9 10 12 15 16 18 20 24 27 30 32 36 40 45 48 54 60 64 71 72 80 90 96 108 120 128 135 142 144 160 180 192 213 216 240 270 284 288 320 355 360 384 426 432 480 540 568 576 639 640 710 720 852 864 960 1,065 1,080 1,136 1,152 1,278 1,420 1,440 1,704 1,728 1,917 1,920 2,130 2,160 2,272 2,556 2,840 2,880 3,195 3,408 3,456 3,834 4,260 4,320 4,544 5,112 5,680 5,760 6,390 6,816 7,668 8,520 8,640 9,088 9,585 10,224 11,360 12,780 13,632 15,336 17,040 17,280 19,170 20,448 22,720 25,560 27,264 30,672 34,080 38,340 40,896 45,440 51,120 61,344 68,160 76,680 81,792 102,240 122,688 136,320 153,360 204,480 245,376 306,720 408,960 613,440 and 1,226,880, with no remainder.
Since 1,226,880 cannot be divided by just 1 and 1,226,880, it is a composite number.