A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2930616 can be evenly divided by 1 2 3 4 6 8 9 12 13 18 24 26 31 36 39 52 62 72 78 93 101 104 117 124 156 186 202 234 248 279 303 312 372 403 404 468 558 606 744 806 808 909 936 1,116 1,209 1,212 1,313 1,612 1,818 2,232 2,418 2,424 2,626 3,131 3,224 3,627 3,636 3,939 4,836 5,252 6,262 7,254 7,272 7,878 9,393 9,672 10,504 11,817 12,524 14,508 15,756 18,786 23,634 25,048 28,179 29,016 31,512 37,572 40,703 47,268 56,358 75,144 81,406 94,536 112,716 122,109 162,812 225,432 244,218 325,624 366,327 488,436 732,654 976,872 1,465,308 and 2,930,616, with no remainder.
Since 2,930,616 cannot be divided by just 1 and 2,930,616, it is not a prime number.