A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8785056 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 17 21 24 28 32 34 42 48 51 56 68 84 96 102 112 119 136 168 204 224 238 272 336 357 408 476 544 672 714 769 816 952 1,428 1,538 1,632 1,904 2,307 2,856 3,076 3,808 4,614 5,383 5,712 6,152 9,228 10,766 11,424 12,304 13,073 16,149 18,456 21,532 24,608 26,146 32,298 36,912 39,219 43,064 52,292 64,596 73,824 78,438 86,128 91,511 104,584 129,192 156,876 172,256 183,022 209,168 258,384 274,533 313,752 366,044 418,336 516,768 549,066 627,504 732,088 1,098,132 1,255,008 1,464,176 2,196,264 2,928,352 4,392,528 and 8,785,056, with no remainder.
Since 8,785,056 cannot be divided by just 1 and 8,785,056, it is not a prime number.