Q: Is 513,991 a Prime Number?
A: Yes, 513,991 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 513991 can be evenly divided by 1 and 513,991, with no remainder.
Since 513,991 can be divided by just 1 and 513,991, it is a prime number.