A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1104768 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 28 32 36 42 48 56 63 64 72 84 96 112 126 128 137 144 168 192 224 252 274 288 336 384 411 448 504 548 576 672 822 896 959 1,008 1,096 1,152 1,233 1,344 1,644 1,918 2,016 2,192 2,466 2,688 2,877 3,288 3,836 4,032 4,384 4,932 5,754 6,576 7,672 8,064 8,631 8,768 9,864 11,508 13,152 15,344 17,262 17,536 19,728 23,016 26,304 30,688 34,524 39,456 46,032 52,608 61,376 69,048 78,912 92,064 122,752 138,096 157,824 184,128 276,192 368,256 552,384 and 1,104,768, with no remainder.
Since 1,104,768 cannot be divided by just 1 and 1,104,768, it is not a prime number.