A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8175160 can be evenly divided by 1 2 4 5 7 8 10 14 20 28 35 40 43 49 56 70 86 97 98 140 172 194 196 215 245 280 301 344 388 392 430 485 490 602 679 776 860 970 980 1,204 1,358 1,505 1,720 1,940 1,960 2,107 2,408 2,716 3,010 3,395 3,880 4,171 4,214 4,753 5,432 6,020 6,790 8,342 8,428 9,506 10,535 12,040 13,580 16,684 16,856 19,012 20,855 21,070 23,765 27,160 29,197 33,368 38,024 41,710 42,140 47,530 58,394 83,420 84,280 95,060 116,788 145,985 166,840 190,120 204,379 233,576 291,970 408,758 583,940 817,516 1,021,895 1,167,880 1,635,032 2,043,790 4,087,580 and 8,175,160, with no remainder.
Since 8,175,160 cannot be divided by just 1 and 8,175,160, it is not a prime number.