A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4850508 can be evenly divided by 1 2 3 4 6 12 13 17 26 31 34 39 51 52 59 62 68 78 93 102 118 124 156 177 186 204 221 236 354 372 403 442 527 663 708 767 806 884 1,003 1,054 1,209 1,326 1,534 1,581 1,612 1,829 2,006 2,108 2,301 2,418 2,652 3,009 3,068 3,162 3,658 4,012 4,602 4,836 5,487 6,018 6,324 6,851 7,316 9,204 10,974 12,036 13,039 13,702 20,553 21,948 23,777 26,078 27,404 31,093 39,117 41,106 47,554 52,156 62,186 71,331 78,234 82,212 93,279 95,108 124,372 142,662 156,468 186,558 285,324 373,116 404,209 808,418 1,212,627 1,616,836 2,425,254 and 4,850,508, with no remainder.
Since 4,850,508 cannot be divided by just 1 and 4,850,508, it is not a prime number.