A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1096704 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 17 18 21 24 28 32 34 36 42 48 51 56 63 64 68 72 84 96 102 112 119 126 128 136 144 153 168 192 204 224 238 252 256 272 288 306 336 357 384 408 448 476 504 512 544 576 612 672 714 768 816 896 952 1,008 1,024 1,071 1,088 1,152 1,224 1,344 1,428 1,536 1,632 1,792 1,904 2,016 2,142 2,176 2,304 2,448 2,688 2,856 3,072 3,264 3,584 3,808 4,032 4,284 4,352 4,608 4,896 5,376 5,712 6,528 7,168 7,616 8,064 8,568 8,704 9,216 9,792 10,752 11,424 13,056 15,232 16,128 17,136 17,408 19,584 21,504 22,848 26,112 30,464 32,256 34,272 39,168 45,696 52,224 60,928 64,512 68,544 78,336 91,392 121,856 137,088 156,672 182,784 274,176 365,568 548,352 and 1,096,704, with no remainder.
Since 1,096,704 cannot be divided by just 1 and 1,096,704, it is not a prime number.