Q: Is 21,880 a Prime Number?
A: No, 21,880 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 21880 can be evenly divided by 1 2 4 5 8 10 20 40 547 1,094 2,188 2,735 4,376 5,470 10,940 and 21,880, with no remainder.
Since 21,880 cannot be divided by just 1 and 21,880, it is not a prime number.