Q: Is 620,821 a Prime Number?
A: Yes, 620,821 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 620821 can be evenly divided by 1 and 620,821, with no remainder.
Since 620,821 can be divided by just 1 and 620,821, it is a prime number.