A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6652338 can be evenly divided by 1 2 3 6 7 11 14 17 21 22 33 34 42 49 51 66 77 98 102 119 121 147 154 187 231 238 242 294 357 363 374 462 539 561 714 726 833 847 1,078 1,122 1,309 1,331 1,617 1,666 1,694 2,057 2,499 2,541 2,618 2,662 3,234 3,927 3,993 4,114 4,998 5,082 5,929 6,171 7,854 7,986 9,163 9,317 11,858 12,342 14,399 17,787 18,326 18,634 22,627 27,489 27,951 28,798 35,574 43,197 45,254 54,978 55,902 65,219 67,881 86,394 100,793 130,438 135,762 158,389 195,657 201,586 302,379 316,778 391,314 475,167 604,758 950,334 1,108,723 2,217,446 3,326,169 and 6,652,338, with no remainder.
Since 6,652,338 cannot be divided by just 1 and 6,652,338, it is not a prime number.