Q: Is 401,551 a Prime Number?
A: Yes, 401,551 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 401551 can be evenly divided by 1 and 401,551, with no remainder.
Since 401,551 can be divided by just 1 and 401,551, it is a prime number.