Q: Is 553,421 a Prime Number?
A: No, 553,421 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 553421 can be evenly divided by 1 11 50,311 and 553,421, with no remainder.
Since 553,421 cannot be divided by just 1 and 553,421, it is not a prime number.