A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 3411144 can be evenly divided by 1 2 3 4 6 8 9 11 12 18 22 24 33 36 44 59 66 72 73 88 99 118 132 146 177 198 219 236 264 292 354 396 438 472 531 584 649 657 708 792 803 876 1,062 1,298 1,314 1,416 1,606 1,752 1,947 2,124 2,409 2,596 2,628 3,212 3,894 4,248 4,307 4,818 5,192 5,256 5,841 6,424 7,227 7,788 8,614 9,636 11,682 12,921 14,454 15,576 17,228 19,272 23,364 25,842 28,908 34,456 38,763 46,728 47,377 51,684 57,816 77,526 94,754 103,368 142,131 155,052 189,508 284,262 310,104 379,016 426,393 568,524 852,786 1,137,048 1,705,572 and 3,411,144, with no remainder.
Since 3,411,144 cannot be divided by just 1 and 3,411,144, it is not a prime number.