Q: Is 21,100 a Prime Number?
A: No, 21,100 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 21100 can be evenly divided by 1 2 4 5 10 20 25 50 100 211 422 844 1,055 2,110 4,220 5,275 10,550 and 21,100, with no remainder.
Since 21,100 cannot be divided by just 1 and 21,100, it is not a prime number.