Q: Is 1,667,721 a Prime Number?
A: No, 1,667,721 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 1667721 can be evenly divided by 1 3 11 33 97 291 521 1,067 1,563 3,201 5,731 17,193 50,537 151,611 555,907 and 1,667,721, with no remainder.
Since 1,667,721 cannot be divided by just 1 and 1,667,721, it is not a prime number.