A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 6780096 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 24 32 36 48 64 72 79 96 144 149 158 192 237 288 298 316 447 474 576 596 632 711 894 948 1,192 1,264 1,341 1,422 1,788 1,896 2,384 2,528 2,682 2,844 3,576 3,792 4,768 5,056 5,364 5,688 7,152 7,584 9,536 10,728 11,376 11,771 14,304 15,168 21,456 22,752 23,542 28,608 35,313 42,912 45,504 47,084 70,626 85,824 94,168 105,939 141,252 188,336 211,878 282,504 376,672 423,756 565,008 753,344 847,512 1,130,016 1,695,024 2,260,032 3,390,048 and 6,780,096, with no remainder.
Since 6,780,096 cannot be divided by just 1 and 6,780,096, it is not a prime number.