Q: Is 661,491 a Prime Number?
A: No, 661,491 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 661491 can be evenly divided by 1 3 9 67 201 603 1,097 3,291 9,873 73,499 220,497 and 661,491, with no remainder.
Since 661,491 cannot be divided by just 1 and 661,491, it is not a prime number.