Q: Is 21,725 a Prime Number?
A: No, 21,725 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 21725 can be evenly divided by 1 5 11 25 55 79 275 395 869 1,975 4,345 and 21,725, with no remainder.
Since 21,725 cannot be divided by just 1 and 21,725, it is not a prime number.