A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8827840 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 40 49 56 64 70 80 98 112 140 160 196 224 245 280 320 392 448 490 560 563 784 980 1,120 1,126 1,568 1,960 2,240 2,252 2,815 3,136 3,920 3,941 4,504 5,630 7,840 7,882 9,008 11,260 15,680 15,764 18,016 19,705 22,520 27,587 31,528 36,032 39,410 45,040 55,174 63,056 78,820 90,080 110,348 126,112 137,935 157,640 180,160 220,696 252,224 275,870 315,280 441,392 551,740 630,560 882,784 1,103,480 1,261,120 1,765,568 2,206,960 4,413,920 and 8,827,840, with no remainder.
Since 8,827,840 cannot be divided by just 1 and 8,827,840, it is not a prime number.