A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3619044 can be evenly divided by 1 2 3 4 6 9 11 12 13 18 19 22 26 33 36 37 38 39 44 52 57 66 74 76 78 99 111 114 117 132 143 148 156 171 198 209 222 228 234 247 286 333 342 396 407 418 429 444 468 481 494 572 627 666 684 703 741 814 836 858 962 988 1,221 1,254 1,287 1,332 1,406 1,443 1,482 1,628 1,716 1,881 1,924 2,109 2,223 2,442 2,508 2,574 2,717 2,812 2,886 2,964 3,663 3,762 4,218 4,329 4,446 4,884 5,148 5,291 5,434 5,772 6,327 7,326 7,524 7,733 8,151 8,436 8,658 8,892 9,139 10,582 10,868 12,654 14,652 15,466 15,873 16,302 17,316 18,278 21,164 23,199 24,453 25,308 27,417 30,932 31,746 32,604 36,556 46,398 47,619 48,906 54,834 63,492 69,597 82,251 92,796 95,238 97,812 100,529 109,668 139,194 164,502 190,476 201,058 278,388 301,587 329,004 402,116 603,174 904,761 1,206,348 1,809,522 and 3,619,044, with no remainder.
Since 3,619,044 cannot be divided by just 1 and 3,619,044, it is not a prime number.