Q: Is 21,147 a Prime Number?
A: No, 21,147 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 21147 can be evenly divided by 1 3 7 19 21 53 57 133 159 371 399 1,007 1,113 3,021 7,049 and 21,147, with no remainder.
Since 21,147 cannot be divided by just 1 and 21,147, it is not a prime number.