The number 1,241,856 can be evenly divided by 1 2 3 4 6 7 8 9 11 12 14 16 18 21 22 24 28 32 33 36 42 44 48 49 56 63 64 66 72 77 84 88 96 98 99 112 126 128 132 144 147 154 168 176 192 196 198 224 231 252 256 264 288 294 308 336 352 384 392 396 441 448 462 504 528 539 576 588 616 672 693 704 768 784 792 882 896 924 1,008 1,056 1,078 1,152 1,176 1,232 1,344 1,386 1,408 1,568 1,584 1,617 1,764 1,792 1,848 2,016 2,112 2,156 2,304 2,352 2,464 2,688 2,772 2,816 3,136 3,168 3,234 3,528 3,696 4,032 4,224 4,312 4,704 4,851 4,928 5,376 5,544 6,272 6,336 6,468 7,056 7,392 8,064 8,448 8,624 9,408 9,702 9,856 11,088 12,544 12,672 12,936 14,112 14,784 16,128 17,248 18,816 19,404 19,712 22,176 25,344 25,872 28,224 29,568 34,496 37,632 38,808 44,352 51,744 56,448 59,136 68,992 77,616 88,704 103,488 112,896 137,984 155,232 177,408 206,976 310,464 413,952 620,928 and 1,241,856, with no remainder.
Since 1,241,856 cannot be divided by just 1 and 1,241,856, it is a composite number.