A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8888964 can be evenly divided by 1 2 3 4 6 7 12 14 21 28 29 41 42 58 82 84 87 89 116 123 164 174 178 203 246 267 287 348 356 406 492 534 574 609 623 812 861 1,068 1,148 1,189 1,218 1,246 1,722 1,869 2,378 2,436 2,492 2,581 3,444 3,567 3,649 3,738 4,756 5,162 7,134 7,298 7,476 7,743 8,323 10,324 10,947 14,268 14,596 15,486 16,646 18,067 21,894 24,969 25,543 30,972 33,292 36,134 43,788 49,938 51,086 54,201 72,268 76,629 99,876 102,172 105,821 108,402 153,258 211,642 216,804 306,516 317,463 423,284 634,926 740,747 1,269,852 1,481,494 2,222,241 2,962,988 4,444,482 and 8,888,964, with no remainder.
Since 8,888,964 cannot be divided by just 1 and 8,888,964, it is not a prime number.