A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 8935836 can be evenly divided by 1 2 3 4 6 7 12 13 14 21 26 28 39 42 49 52 78 84 91 98 147 156 167 182 196 273 294 334 343 364 501 546 588 637 668 686 1,002 1,029 1,092 1,169 1,274 1,372 1,911 2,004 2,058 2,171 2,338 2,548 3,507 3,822 4,116 4,342 4,459 4,676 6,513 7,014 7,644 8,183 8,684 8,918 13,026 13,377 14,028 15,197 16,366 17,836 24,549 26,052 26,754 30,394 32,732 45,591 49,098 53,508 57,281 60,788 91,182 98,196 106,379 114,562 171,843 182,364 212,758 229,124 319,137 343,686 425,516 638,274 687,372 744,653 1,276,548 1,489,306 2,233,959 2,978,612 4,467,918 and 8,935,836, with no remainder.
Since 8,935,836 cannot be divided by just 1 and 8,935,836, it is not a prime number.