The number 818,496 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 49 56 58 63 64 72 84 87 96 98 112 116 126 144 147 168 174 192 196 203 224 232 252 261 288 294 336 348 392 406 441 448 464 504 522 576 588 609 672 696 784 812 882 928 1,008 1,044 1,176 1,218 1,344 1,392 1,421 1,568 1,624 1,764 1,827 1,856 2,016 2,088 2,352 2,436 2,784 2,842 3,136 3,248 3,528 3,654 4,032 4,176 4,263 4,704 4,872 5,568 5,684 6,496 7,056 7,308 8,352 8,526 9,408 9,744 11,368 12,789 12,992 14,112 14,616 16,704 17,052 19,488 22,736 25,578 28,224 29,232 34,104 38,976 45,472 51,156 58,464 68,208 90,944 102,312 116,928 136,416 204,624 272,832 409,248 and 818,496, with no remainder.
Since 818,496 cannot be divided by just 1 and 818,496, it is a composite number.