A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8111670 can be evenly divided by 1 2 3 5 6 7 10 14 15 19 21 30 35 38 42 57 70 95 105 107 114 133 190 210 214 266 285 321 361 399 535 570 642 665 722 749 798 1,070 1,083 1,330 1,498 1,605 1,805 1,995 2,033 2,166 2,247 2,527 3,210 3,610 3,745 3,990 4,066 4,494 5,054 5,415 6,099 7,490 7,581 10,165 10,830 11,235 12,198 12,635 14,231 15,162 20,330 22,470 25,270 28,462 30,495 37,905 38,627 42,693 60,990 71,155 75,810 77,254 85,386 115,881 142,310 193,135 213,465 231,762 270,389 386,270 426,930 540,778 579,405 811,167 1,158,810 1,351,945 1,622,334 2,703,890 4,055,835 and 8,111,670, with no remainder.
Since 8,111,670 cannot be divided by just 1 and 8,111,670, it is not a prime number.