A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8512350 can be evenly divided by 1 2 3 5 6 7 10 11 14 15 21 22 25 30 33 35 42 50 55 66 67 70 75 77 105 110 121 134 150 154 165 175 201 210 231 242 275 330 335 350 363 385 402 462 469 525 550 605 670 726 737 770 825 847 938 1,005 1,050 1,155 1,210 1,407 1,474 1,650 1,675 1,694 1,815 1,925 2,010 2,211 2,310 2,345 2,541 2,814 3,025 3,350 3,630 3,685 3,850 4,235 4,422 4,690 5,025 5,082 5,159 5,775 6,050 7,035 7,370 8,107 8,470 9,075 10,050 10,318 11,055 11,550 11,725 12,705 14,070 15,477 16,214 18,150 18,425 21,175 22,110 23,450 24,321 25,410 25,795 30,954 35,175 36,850 40,535 42,350 48,642 51,590 55,275 56,749 63,525 70,350 77,385 81,070 110,550 113,498 121,605 127,050 128,975 154,770 170,247 202,675 243,210 257,950 283,745 340,494 386,925 405,350 567,490 608,025 773,850 851,235 1,216,050 1,418,725 1,702,470 2,837,450 4,256,175 and 8,512,350, with no remainder.
Since 8,512,350 cannot be divided by just 1 and 8,512,350, it is not a prime number.