A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9617724 can be evenly divided by 1 2 3 4 6 9 12 18 19 27 36 38 43 54 57 76 86 108 109 114 129 171 172 218 228 258 327 342 387 436 513 516 654 684 774 817 981 1,026 1,161 1,308 1,548 1,634 1,962 2,052 2,071 2,322 2,451 2,943 3,268 3,924 4,142 4,644 4,687 4,902 5,886 6,213 7,353 8,284 9,374 9,804 11,772 12,426 14,061 14,706 18,639 18,748 22,059 24,852 28,122 29,412 37,278 42,183 44,118 55,917 56,244 74,556 84,366 88,236 89,053 111,834 126,549 168,732 178,106 223,668 253,098 267,159 356,212 506,196 534,318 801,477 1,068,636 1,602,954 2,404,431 3,205,908 4,808,862 and 9,617,724, with no remainder.
Since 9,617,724 cannot be divided by just 1 and 9,617,724, it is not a prime number.