Q: Is 21,860 a Prime Number?
A: No, 21,860 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 21860 can be evenly divided by 1 2 4 5 10 20 1,093 2,186 4,372 5,465 10,930 and 21,860, with no remainder.
Since 21,860 cannot be divided by just 1 and 21,860, it is not a prime number.