A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2371446 can be evenly divided by 1 2 3 6 7 9 11 14 18 21 22 29 33 42 58 59 63 66 77 87 99 118 126 154 174 177 198 203 231 261 319 354 406 413 462 522 531 609 638 649 693 826 957 1,062 1,218 1,239 1,298 1,386 1,711 1,827 1,914 1,947 2,233 2,478 2,871 3,422 3,654 3,717 3,894 4,466 4,543 5,133 5,742 5,841 6,699 7,434 9,086 10,266 11,682 11,977 13,398 13,629 15,399 18,821 20,097 23,954 27,258 30,798 35,931 37,642 40,194 40,887 56,463 71,862 81,774 107,793 112,926 131,747 169,389 215,586 263,494 338,778 395,241 790,482 1,185,723 and 2,371,446, with no remainder.
Since 2,371,446 cannot be divided by just 1 and 2,371,446, it is not a prime number.