A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 5117574 can be evenly divided by 1 2 3 6 7 11 14 19 21 22 33 38 42 53 57 66 77 106 114 121 133 154 159 209 231 242 266 318 363 371 399 418 462 583 627 726 742 798 847 1,007 1,113 1,166 1,254 1,463 1,694 1,749 2,014 2,226 2,299 2,541 2,926 3,021 3,498 4,081 4,389 4,598 5,082 6,042 6,413 6,897 7,049 8,162 8,778 11,077 12,243 12,826 13,794 14,098 16,093 19,239 21,147 22,154 24,486 32,186 33,231 38,478 42,294 44,891 48,279 66,462 77,539 89,782 96,558 121,847 134,673 155,078 232,617 243,694 269,346 365,541 465,234 731,082 852,929 1,705,858 2,558,787 and 5,117,574, with no remainder.
Since 5,117,574 cannot be divided by just 1 and 5,117,574, it is not a prime number.