Q: Is 20,551 a Prime Number?
A: Yes, 20,551 is a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 20551 can be evenly divided by 1 and 20,551, with no remainder.
Since 20,551 can be divided by just 1 and 20,551, it is a prime number.