Q: Is 621,401 a Prime Number?
A: No, 621,401 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 621401 can be evenly divided by 1 11 17 187 3,323 36,553 56,491 and 621,401, with no remainder.
Since 621,401 cannot be divided by just 1 and 621,401, it is not a prime number.