Q: Is 2,821 a Prime Number?
A: No, 2,821 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 2821 can be evenly divided by 1 7 13 31 91 217 403 and 2,821, with no remainder.
Since 2,821 cannot be divided by just 1 and 2,821, it is not a prime number.