Q: Is 21,380 a Prime Number?
A: No, 21,380 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 21380 can be evenly divided by 1 2 4 5 10 20 1,069 2,138 4,276 5,345 10,690 and 21,380, with no remainder.
Since 21,380 cannot be divided by just 1 and 21,380, it is not a prime number.