A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 7813674 can be evenly divided by 1 2 3 6 9 11 18 19 22 31 33 38 57 62 66 67 93 99 114 134 171 186 198 201 209 279 341 342 402 418 558 589 603 627 682 737 1,023 1,178 1,206 1,254 1,273 1,474 1,767 1,881 2,046 2,077 2,211 2,546 3,069 3,534 3,762 3,819 4,154 4,422 5,301 6,138 6,231 6,479 6,633 7,638 10,602 11,457 12,462 12,958 13,266 14,003 18,693 19,437 22,847 22,914 28,006 37,386 38,874 39,463 42,009 45,694 58,311 68,541 78,926 84,018 116,622 118,389 126,027 137,082 205,623 236,778 252,054 355,167 411,246 434,093 710,334 868,186 1,302,279 2,604,558 3,906,837 and 7,813,674, with no remainder.
Since 7,813,674 cannot be divided by just 1 and 7,813,674, it is not a prime number.