Q: Is 400,013 a Prime Number?
A: No, 400,013 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 400013 can be evenly divided by 1 607 659 and 400,013, with no remainder.
Since 400,013 cannot be divided by just 1 and 400,013, it is not a prime number.