A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 4093056 can be evenly divided by 1 2 3 4 6 8 9 11 12 16 17 18 19 22 24 32 33 34 36 38 44 48 51 57 64 66 68 72 76 88 96 99 102 114 128 132 136 144 152 153 171 176 187 192 198 204 209 228 264 272 288 304 306 323 342 352 374 384 396 408 418 456 528 544 561 576 608 612 627 646 684 704 748 792 816 836 912 969 1,056 1,088 1,122 1,152 1,216 1,224 1,254 1,292 1,368 1,408 1,496 1,584 1,632 1,672 1,683 1,824 1,881 1,938 2,112 2,176 2,244 2,432 2,448 2,508 2,584 2,736 2,907 2,992 3,168 3,264 3,344 3,366 3,553 3,648 3,762 3,876 4,224 4,488 4,896 5,016 5,168 5,472 5,814 5,984 6,336 6,528 6,688 6,732 7,106 7,296 7,524 7,752 8,976 9,792 10,032 10,336 10,659 10,944 11,628 11,968 12,672 13,376 13,464 14,212 15,048 15,504 17,952 19,584 20,064 20,672 21,318 21,888 23,256 23,936 26,752 26,928 28,424 30,096 31,008 31,977 35,904 40,128 41,344 42,636 46,512 53,856 56,848 60,192 62,016 63,954 71,808 80,256 85,272 93,024 107,712 113,696 120,384 124,032 127,908 170,544 186,048 215,424 227,392 240,768 255,816 341,088 372,096 454,784 511,632 682,176 1,023,264 1,364,352 2,046,528 and 4,093,056, with no remainder.
Since 4,093,056 cannot be divided by just 1 and 4,093,056, it is not a prime number.