Q: Is 640,768 a Prime Number?
A: No, 640,768 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 640768 can be evenly divided by 1 2 4 8 16 32 64 128 256 2,503 5,006 10,012 20,024 40,048 80,096 160,192 320,384 and 640,768, with no remainder.
Since 640,768 cannot be divided by just 1 and 640,768, it is not a prime number.