Q: Is 640,540 a Prime Number?
A: No, 640,540 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 640540 can be evenly divided by 1 2 4 5 10 20 32,027 64,054 128,108 160,135 320,270 and 640,540, with no remainder.
Since 640,540 cannot be divided by just 1 and 640,540, it is not a prime number.