A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8482860 can be evenly divided by 1 2 3 4 5 6 9 10 12 15 18 20 23 27 30 36 45 46 54 60 69 90 92 108 115 135 138 180 207 230 270 276 345 414 460 540 621 683 690 828 1,035 1,242 1,366 1,380 2,049 2,070 2,484 2,732 3,105 3,415 4,098 4,140 6,147 6,210 6,830 8,196 10,245 12,294 12,420 13,660 15,709 18,441 20,490 24,588 30,735 31,418 36,882 40,980 47,127 61,470 62,836 73,764 78,545 92,205 94,254 122,940 141,381 157,090 184,410 188,508 235,635 282,762 314,180 368,820 424,143 471,270 565,524 706,905 848,286 942,540 1,413,810 1,696,572 2,120,715 2,827,620 4,241,430 and 8,482,860, with no remainder.
Since 8,482,860 cannot be divided by just 1 and 8,482,860, it is not a prime number.