Q: Is 213,561 a Prime Number?
A: No, 213,561 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 213561 can be evenly divided by 1 3 9 61 183 389 549 1,167 3,501 23,729 71,187 and 213,561, with no remainder.
Since 213,561 cannot be divided by just 1 and 213,561, it is not a prime number.