Q: Is 21,765 a Prime Number?
A: No, 21,765 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 21765 can be evenly divided by 1 3 5 15 1,451 4,353 7,255 and 21,765, with no remainder.
Since 21,765 cannot be divided by just 1 and 21,765, it is not a prime number.