A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2254098 can be evenly divided by 1 2 3 6 7 11 14 17 21 22 33 34 41 42 49 51 66 77 82 98 102 119 123 147 154 187 231 238 246 287 294 357 374 451 462 539 561 574 697 714 833 861 902 1,078 1,122 1,309 1,353 1,394 1,617 1,666 1,722 2,009 2,091 2,499 2,618 2,706 3,157 3,234 3,927 4,018 4,182 4,879 4,998 6,027 6,314 7,667 7,854 9,163 9,471 9,758 12,054 14,637 15,334 18,326 18,942 22,099 23,001 27,489 29,274 34,153 44,198 46,002 53,669 54,978 66,297 68,306 102,459 107,338 132,594 161,007 204,918 322,014 375,683 751,366 1,127,049 and 2,254,098, with no remainder.
Since 2,254,098 cannot be divided by just 1 and 2,254,098, it is not a prime number.