A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2090016 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 27 32 36 41 48 54 59 72 82 96 108 118 123 144 164 177 216 236 246 288 328 354 369 432 472 492 531 656 708 738 864 944 984 1,062 1,107 1,312 1,416 1,476 1,593 1,888 1,968 2,124 2,214 2,419 2,832 2,952 3,186 3,936 4,248 4,428 4,838 5,664 5,904 6,372 7,257 8,496 8,856 9,676 11,808 12,744 14,514 16,992 17,712 19,352 21,771 25,488 29,028 35,424 38,704 43,542 50,976 58,056 65,313 77,408 87,084 116,112 130,626 174,168 232,224 261,252 348,336 522,504 696,672 1,045,008 and 2,090,016, with no remainder.
Since 2,090,016 cannot be divided by just 1 and 2,090,016, it is not a prime number.