A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8793288 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 18 21 24 28 36 42 56 63 72 73 84 126 146 168 219 239 252 292 438 478 504 511 584 657 717 876 956 1,022 1,314 1,434 1,533 1,673 1,752 1,912 2,044 2,151 2,628 2,868 3,066 3,346 4,088 4,302 4,599 5,019 5,256 5,736 6,132 6,692 8,604 9,198 10,038 12,264 13,384 15,057 17,208 17,447 18,396 20,076 30,114 34,894 36,792 40,152 52,341 60,228 69,788 104,682 120,456 122,129 139,576 157,023 209,364 244,258 314,046 366,387 418,728 488,516 628,092 732,774 977,032 1,099,161 1,256,184 1,465,548 2,198,322 2,931,096 4,396,644 and 8,793,288, with no remainder.
Since 8,793,288 cannot be divided by just 1 and 8,793,288, it is not a prime number.