Q: Is 640,261 a Prime Number?
A: Yes, 640,261 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 640261 can be evenly divided by 1 and 640,261, with no remainder.
Since 640,261 can be divided by just 1 and 640,261, it is a prime number.