Q: Is 166,421 a Prime Number?
A: No, 166,421 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 166421 can be evenly divided by 1 19 361 461 8,759 and 166,421, with no remainder.
Since 166,421 cannot be divided by just 1 and 166,421, it is not a prime number.