Q: Is 21,771 a Prime Number?
A: No, 21,771 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 21771 can be evenly divided by 1 3 9 41 59 123 177 369 531 2,419 7,257 and 21,771, with no remainder.
Since 21,771 cannot be divided by just 1 and 21,771, it is not a prime number.