Q: Is 1,661,667 a Prime Number?
A: No, 1,661,667 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 1661667 can be evenly divided by 1 3 7 21 67 201 469 1,181 1,407 3,543 8,267 24,801 79,127 237,381 553,889 and 1,661,667, with no remainder.
Since 1,661,667 cannot be divided by just 1 and 1,661,667, it is not a prime number.