A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8016288 can be evenly divided by 1 2 3 4 6 7 8 12 14 16 21 24 28 32 42 48 56 79 84 96 112 151 158 168 224 237 302 316 336 453 474 553 604 632 672 906 948 1,057 1,106 1,208 1,264 1,659 1,812 1,896 2,114 2,212 2,416 2,528 3,171 3,318 3,624 3,792 4,228 4,424 4,832 6,342 6,636 7,248 7,584 8,456 8,848 11,929 12,684 13,272 14,496 16,912 17,696 23,858 25,368 26,544 33,824 35,787 47,716 50,736 53,088 71,574 83,503 95,432 101,472 143,148 167,006 190,864 250,509 286,296 334,012 381,728 501,018 572,592 668,024 1,002,036 1,145,184 1,336,048 2,004,072 2,672,096 4,008,144 and 8,016,288, with no remainder.
Since 8,016,288 cannot be divided by just 1 and 8,016,288, it is not a prime number.