A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 9084096 can be evenly divided by 1 2 3 4 6 7 8 9 12 14 16 18 21 24 27 28 32 36 42 48 54 56 63 64 72 84 96 108 112 126 144 168 189 192 216 224 252 288 336 378 432 448 504 576 672 751 756 864 1,008 1,344 1,502 1,512 1,728 2,016 2,253 3,004 3,024 4,032 4,506 5,257 6,008 6,048 6,759 9,012 10,514 12,016 12,096 13,518 15,771 18,024 20,277 21,028 24,032 27,036 31,542 36,048 40,554 42,056 47,313 48,064 54,072 63,084 72,096 81,108 84,112 94,626 108,144 126,168 141,939 144,192 162,216 168,224 189,252 216,288 252,336 283,878 324,432 336,448 378,504 432,576 504,672 567,756 648,864 757,008 1,009,344 1,135,512 1,297,728 1,514,016 2,271,024 3,028,032 4,542,048 and 9,084,096, with no remainder.
Since 9,084,096 cannot be divided by just 1 and 9,084,096, it is not a prime number.