Q: Is 128,256 a Prime Number?
A: No, 128,256 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 128256 can be evenly divided by 1 2 3 4 6 8 12 16 24 32 48 64 96 128 167 192 256 334 384 501 668 768 1,002 1,336 2,004 2,672 4,008 5,344 8,016 10,688 16,032 21,376 32,064 42,752 64,128 and 128,256, with no remainder.
Since 128,256 cannot be divided by just 1 and 128,256, it is not a prime number.