Q: Is 21,275 a Prime Number?
A: No, 21,275 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 21275 can be evenly divided by 1 5 23 25 37 115 185 575 851 925 4,255 and 21,275, with no remainder.
Since 21,275 cannot be divided by just 1 and 21,275, it is not a prime number.