A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8502312 can be evenly divided by 1 2 3 4 6 7 8 12 13 14 17 21 24 26 28 34 39 42 51 52 56 68 78 84 91 102 104 119 136 156 168 182 204 221 229 238 273 312 357 364 408 442 458 476 546 663 687 714 728 884 916 952 1,092 1,326 1,374 1,428 1,547 1,603 1,768 1,832 2,184 2,652 2,748 2,856 2,977 3,094 3,206 3,893 4,641 4,809 5,304 5,496 5,954 6,188 6,412 7,786 8,931 9,282 9,618 11,679 11,908 12,376 12,824 15,572 17,862 18,564 19,236 20,839 23,358 23,816 27,251 31,144 35,724 37,128 38,472 41,678 46,716 50,609 54,502 62,517 71,448 81,753 83,356 93,432 101,218 109,004 125,034 151,827 163,506 166,712 202,436 218,008 250,068 303,654 327,012 354,263 404,872 500,136 607,308 654,024 708,526 1,062,789 1,214,616 1,417,052 2,125,578 2,834,104 4,251,156 and 8,502,312, with no remainder.
Since 8,502,312 cannot be divided by just 1 and 8,502,312, it is not a prime number.