A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8622048 can be evenly divided by 1 2 3 4 6 8 12 16 19 24 29 32 38 48 57 58 76 87 96 114 116 152 163 174 228 232 304 326 348 456 464 489 551 608 652 696 912 928 978 1,102 1,304 1,392 1,653 1,824 1,956 2,204 2,608 2,784 3,097 3,306 3,912 4,408 4,727 5,216 6,194 6,612 7,824 8,816 9,291 9,454 12,388 13,224 14,181 15,648 17,632 18,582 18,908 24,776 26,448 28,362 37,164 37,816 49,552 52,896 56,724 74,328 75,632 89,813 99,104 113,448 148,656 151,264 179,626 226,896 269,439 297,312 359,252 453,792 538,878 718,504 1,077,756 1,437,008 2,155,512 2,874,016 4,311,024 and 8,622,048, with no remainder.
Since 8,622,048 cannot be divided by just 1 and 8,622,048, it is not a prime number.