A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8551452 can be evenly divided by 1 2 3 4 6 7 12 13 14 21 26 28 39 41 42 52 78 82 84 91 123 156 164 182 191 246 273 287 364 382 492 533 546 573 574 764 861 1,066 1,092 1,146 1,148 1,337 1,599 1,722 2,132 2,292 2,483 2,674 3,198 3,444 3,731 4,011 4,966 5,348 6,396 7,449 7,462 7,831 8,022 9,932 11,193 14,898 14,924 15,662 16,044 17,381 22,386 23,493 29,796 31,324 34,762 44,772 46,986 52,143 54,817 69,524 93,972 101,803 104,286 109,634 164,451 203,606 208,572 219,268 305,409 328,902 407,212 610,818 657,804 712,621 1,221,636 1,425,242 2,137,863 2,850,484 4,275,726 and 8,551,452, with no remainder.
Since 8,551,452 cannot be divided by just 1 and 8,551,452, it is not a prime number.