Q: Is 721,423 a Prime Number?
A: No, 721,423 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 721423 can be evenly divided by 1 587 1,229 and 721,423, with no remainder.
Since 721,423 cannot be divided by just 1 and 721,423, it is not a prime number.