Q: Is 21,088 a Prime Number?
A: No, 21,088 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 21088 can be evenly divided by 1 2 4 8 16 32 659 1,318 2,636 5,272 10,544 and 21,088, with no remainder.
Since 21,088 cannot be divided by just 1 and 21,088, it is not a prime number.