Q: Is 315,721 a Prime Number?
A: No, 315,721 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 315721 can be evenly divided by 1 7 23 37 53 161 259 371 851 1,219 1,961 5,957 8,533 13,727 45,103 and 315,721, with no remainder.
Since 315,721 cannot be divided by just 1 and 315,721, it is not a prime number.