Q: Is 155,421 a Prime Number?
A: No, 155,421 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 155421 can be evenly divided by 1 3 7 9 21 63 2,467 7,401 17,269 22,203 51,807 and 155,421, with no remainder.
Since 155,421 cannot be divided by just 1 and 155,421, it is not a prime number.