Q: Is 138,581 a Prime Number?
A: Yes, 138,581 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 138581 can be evenly divided by 1 and 138,581, with no remainder.
Since 138,581 can be divided by just 1 and 138,581, it is a prime number.