A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4072068 can be evenly divided by 1 2 3 4 6 7 9 11 12 13 14 18 21 22 26 28 33 36 39 42 44 52 63 66 77 78 84 91 99 113 117 126 132 143 154 156 182 198 226 231 234 252 273 286 308 339 364 396 429 452 462 468 546 572 678 693 791 819 858 924 1,001 1,017 1,092 1,243 1,287 1,356 1,386 1,469 1,582 1,638 1,716 2,002 2,034 2,373 2,486 2,574 2,772 2,938 3,003 3,164 3,276 3,729 4,004 4,068 4,407 4,746 4,972 5,148 5,876 6,006 7,119 7,458 8,701 8,814 9,009 9,492 10,283 11,187 12,012 13,221 14,238 14,916 16,159 17,402 17,628 18,018 20,566 22,374 26,103 26,442 28,476 30,849 32,318 34,804 36,036 41,132 44,748 48,477 52,206 52,884 61,698 64,636 78,309 92,547 96,954 104,412 113,113 123,396 145,431 156,618 185,094 193,908 226,226 290,862 313,236 339,339 370,188 452,452 581,724 678,678 1,018,017 1,357,356 2,036,034 and 4,072,068, with no remainder.
Since 4,072,068 cannot be divided by just 1 and 4,072,068, it is not a prime number.