Q: Is 21,670 a Prime Number?
A: No, 21,670 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 21670 can be evenly divided by 1 2 5 10 11 22 55 110 197 394 985 1,970 2,167 4,334 10,835 and 21,670, with no remainder.
Since 21,670 cannot be divided by just 1 and 21,670, it is not a prime number.