Q: Is 266,665 a Prime Number?
A: No, 266,665 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 266665 can be evenly divided by 1 5 7 19 35 95 133 401 665 2,005 2,807 7,619 14,035 38,095 53,333 and 266,665, with no remainder.
Since 266,665 cannot be divided by just 1 and 266,665, it is not a prime number.