A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4634916 can be evenly divided by 1 2 3 4 6 11 12 13 22 26 33 37 39 44 52 66 73 74 78 111 132 143 146 148 156 219 222 286 292 407 429 438 444 481 572 803 814 858 876 949 962 1,221 1,443 1,606 1,628 1,716 1,898 1,924 2,409 2,442 2,701 2,847 2,886 3,212 3,796 4,818 4,884 5,291 5,402 5,694 5,772 8,103 9,636 10,439 10,582 10,804 11,388 15,873 16,206 20,878 21,164 29,711 31,317 31,746 32,412 35,113 41,756 59,422 62,634 63,492 70,226 89,133 105,339 118,844 125,268 140,452 178,266 210,678 356,532 386,243 421,356 772,486 1,158,729 1,544,972 2,317,458 and 4,634,916, with no remainder.
Since 4,634,916 cannot be divided by just 1 and 4,634,916, it is not a prime number.