Q: Is 356,421 a Prime Number?
A: No, 356,421 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 356421 can be evenly divided by 1 3 13 19 37 39 57 111 169 247 481 507 703 741 1,443 2,109 3,211 6,253 9,139 9,633 18,759 27,417 118,807 and 356,421, with no remainder.
Since 356,421 cannot be divided by just 1 and 356,421, it is not a prime number.