Q: Is 661,821 a Prime Number?
A: No, 661,821 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 661821 can be evenly divided by 1 3 167 501 1,321 3,963 220,607 and 661,821, with no remainder.
Since 661,821 cannot be divided by just 1 and 661,821, it is not a prime number.