A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2429028 can be evenly divided by 1 2 3 4 6 7 9 12 14 17 18 21 27 28 34 36 42 49 51 54 63 68 81 84 98 102 108 119 126 147 153 162 189 196 204 238 243 252 294 306 324 357 378 441 459 476 486 567 588 612 714 729 756 833 882 918 972 1,071 1,134 1,323 1,377 1,428 1,458 1,666 1,701 1,764 1,836 2,142 2,268 2,499 2,646 2,754 2,916 3,213 3,332 3,402 3,969 4,131 4,284 4,998 5,103 5,292 5,508 6,426 6,804 7,497 7,938 8,262 9,639 9,996 10,206 11,907 12,393 12,852 14,994 15,876 16,524 19,278 20,412 22,491 23,814 24,786 28,917 29,988 35,721 38,556 44,982 47,628 49,572 57,834 67,473 71,442 86,751 89,964 115,668 134,946 142,884 173,502 202,419 269,892 347,004 404,838 607,257 809,676 1,214,514 and 2,429,028, with no remainder.
Since 2,429,028 cannot be divided by just 1 and 2,429,028, it is not a prime number.