Q: Is 1,561,321 a Prime Number?
A: No, 1,561,321 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 1561321 can be evenly divided by 1 41 113 337 4,633 13,817 38,081 and 1,561,321, with no remainder.
Since 1,561,321 cannot be divided by just 1 and 1,561,321, it is not a prime number.