A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8552544 can be evenly divided by 1 2 3 4 6 7 8 11 12 13 14 16 21 22 24 26 28 32 33 39 42 44 48 52 56 66 77 78 84 88 89 91 96 104 112 132 143 154 156 168 176 178 182 208 224 231 264 267 273 286 308 312 336 352 356 364 416 429 462 528 534 546 572 616 623 624 672 712 728 858 924 979 1,001 1,056 1,068 1,092 1,144 1,157 1,232 1,246 1,248 1,424 1,456 1,716 1,848 1,869 1,958 2,002 2,136 2,184 2,288 2,314 2,464 2,492 2,848 2,912 2,937 3,003 3,432 3,471 3,696 3,738 3,916 4,004 4,272 4,368 4,576 4,628 4,984 5,874 6,006 6,853 6,864 6,942 7,392 7,476 7,832 8,008 8,099 8,544 8,736 9,256 9,968 11,748 12,012 12,727 13,706 13,728 13,884 14,952 15,664 16,016 16,198 18,512 19,936 20,559 23,496 24,024 24,297 25,454 27,412 27,768 29,904 31,328 32,032 32,396 37,024 38,181 41,118 46,992 48,048 48,594 50,908 54,824 55,536 59,808 64,792 76,362 82,236 89,089 93,984 96,096 97,188 101,816 109,648 111,072 129,584 152,724 164,472 178,178 194,376 203,632 219,296 259,168 267,267 305,448 328,944 356,356 388,752 407,264 534,534 610,896 657,888 712,712 777,504 1,069,068 1,221,792 1,425,424 2,138,136 2,850,848 4,276,272 and 8,552,544, with no remainder.
Since 8,552,544 cannot be divided by just 1 and 8,552,544, it is not a prime number.