A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2717442 can be evenly divided by 1 2 3 6 7 9 13 14 18 21 26 27 39 42 49 54 63 78 79 91 98 117 126 147 158 182 189 234 237 273 294 351 378 441 474 546 553 637 702 711 819 882 1,027 1,106 1,274 1,323 1,422 1,638 1,659 1,911 2,054 2,133 2,457 2,646 3,081 3,318 3,822 3,871 4,266 4,914 4,977 5,733 6,162 7,189 7,742 9,243 9,954 11,466 11,613 14,378 14,931 17,199 18,486 21,567 23,226 27,729 29,862 34,398 34,839 43,134 50,323 55,458 64,701 69,678 100,646 104,517 129,402 150,969 194,103 209,034 301,938 388,206 452,907 905,814 1,358,721 and 2,717,442, with no remainder.
Since 2,717,442 cannot be divided by just 1 and 2,717,442, it is not a prime number.