A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8291700 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 25 27 30 36 37 45 50 54 60 74 75 83 90 100 108 111 135 148 150 166 180 185 222 225 249 270 300 332 333 370 415 444 450 498 540 555 666 675 740 747 830 900 925 996 999 1,110 1,245 1,332 1,350 1,494 1,660 1,665 1,850 1,998 2,075 2,220 2,241 2,490 2,700 2,775 2,988 3,071 3,330 3,700 3,735 3,996 4,150 4,482 4,980 4,995 5,550 6,142 6,225 6,660 7,470 8,300 8,325 8,964 9,213 9,990 11,100 11,205 12,284 12,450 14,940 15,355 16,650 18,426 18,675 19,980 22,410 24,900 24,975 27,639 30,710 33,300 36,852 37,350 44,820 46,065 49,950 55,278 56,025 61,420 74,700 76,775 82,917 92,130 99,900 110,556 112,050 138,195 153,550 165,834 184,260 224,100 230,325 276,390 307,100 331,668 414,585 460,650 552,780 690,975 829,170 921,300 1,381,950 1,658,340 2,072,925 2,763,900 4,145,850 and 8,291,700, with no remainder.
Since 8,291,700 cannot be divided by just 1 and 8,291,700, it is not a prime number.