The number 3,917,088 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 29 32 36 42 48 56 58 63 67 72 84 87 96 112 116 126 134 144 168 174 201 203 224 232 252 261 268 288 336 348 402 406 464 469 504 522 536 603 609 672 696 804 812 928 938 1,008 1,044 1,072 1,206 1,218 1,392 1,407 1,608 1,624 1,827 1,876 1,943 2,016 2,088 2,144 2,412 2,436 2,784 2,814 3,216 3,248 3,654 3,752 3,886 4,176 4,221 4,824 4,872 5,628 5,829 6,432 6,496 7,308 7,504 7,772 8,352 8,442 9,648 9,744 11,256 11,658 13,601 14,616 15,008 15,544 16,884 17,487 19,296 19,488 22,512 23,316 27,202 29,232 31,088 33,768 34,974 40,803 45,024 46,632 54,404 58,464 62,176 67,536 69,948 81,606 93,264 108,808 122,409 135,072 139,896 163,212 186,528 217,616 244,818 279,792 326,424 435,232 489,636 559,584 652,848 979,272 1,305,696 1,958,544 and 3,917,088, with no remainder.
Since 3,917,088 cannot be divided by just 1 and 3,917,088, it is a composite number.