Q: Is 661,791 a Prime Number?
A: No, 661,791 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 661791 can be evenly divided by 1 3 13 39 71 213 239 717 923 2,769 3,107 9,321 16,969 50,907 220,597 and 661,791, with no remainder.
Since 661,791 cannot be divided by just 1 and 661,791, it is not a prime number.