Q: Is 21,825 a Prime Number?
A: No, 21,825 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 21825 can be evenly divided by 1 3 5 9 15 25 45 75 97 225 291 485 873 1,455 2,425 4,365 7,275 and 21,825, with no remainder.
Since 21,825 cannot be divided by just 1 and 21,825, it is not a prime number.