Q: Is 623,401 a Prime Number?
A: Yes, 623,401 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 623401 can be evenly divided by 1 and 623,401, with no remainder.
Since 623,401 can be divided by just 1 and 623,401, it is a prime number.