Q: Is 1,257,642 a Prime Number?
A: No, 1,257,642 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 1257642 can be evenly divided by 1 2 3 6 9 18 109 218 327 641 654 981 1,282 1,923 1,962 3,846 5,769 11,538 69,869 139,738 209,607 419,214 628,821 and 1,257,642, with no remainder.
Since 1,257,642 cannot be divided by just 1 and 1,257,642, it is not a prime number.