A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8791692 can be evenly divided by 1 2 3 4 6 7 12 13 14 21 26 28 39 42 52 78 83 84 91 97 156 166 182 194 249 273 291 332 364 388 498 546 581 582 679 996 1,079 1,092 1,162 1,164 1,261 1,358 1,743 2,037 2,158 2,324 2,522 2,716 3,237 3,486 3,783 4,074 4,316 5,044 6,474 6,972 7,553 7,566 8,051 8,148 8,827 12,948 15,106 15,132 16,102 17,654 22,659 24,153 26,481 30,212 32,204 35,308 45,318 48,306 52,962 56,357 90,636 96,612 104,663 105,924 112,714 169,071 209,326 225,428 313,989 338,142 418,652 627,978 676,284 732,641 1,255,956 1,465,282 2,197,923 2,930,564 4,395,846 and 8,791,692, with no remainder.
Since 8,791,692 cannot be divided by just 1 and 8,791,692, it is not a prime number.