Q: Is 1,561,743 a Prime Number?
A: No, 1,561,743 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 1561743 can be evenly divided by 1 3 9 19 57 171 9,133 27,399 82,197 173,527 520,581 and 1,561,743, with no remainder.
Since 1,561,743 cannot be divided by just 1 and 1,561,743, it is not a prime number.