The number 1,081,584 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 29 36 37 42 48 56 58 63 72 74 84 87 111 112 116 126 144 148 168 174 203 222 232 252 259 261 296 333 336 348 406 444 464 504 518 522 592 609 666 696 777 812 888 1,008 1,036 1,044 1,073 1,218 1,332 1,392 1,554 1,624 1,776 1,827 2,072 2,088 2,146 2,331 2,436 2,664 3,108 3,219 3,248 3,654 4,144 4,176 4,292 4,662 4,872 5,328 6,216 6,438 7,308 7,511 8,584 9,324 9,657 9,744 12,432 12,876 14,616 15,022 17,168 18,648 19,314 22,533 25,752 29,232 30,044 37,296 38,628 45,066 51,504 60,088 67,599 77,256 90,132 120,176 135,198 154,512 180,264 270,396 360,528 540,792 and 1,081,584, with no remainder.
Since 1,081,584 cannot be divided by just 1 and 1,081,584, it is a composite number.