Q: Is 266,721 a Prime Number?
A: No, 266,721 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 266721 can be evenly divided by 1 3 7 13 21 39 91 273 977 2,931 6,839 12,701 20,517 38,103 88,907 and 266,721, with no remainder.
Since 266,721 cannot be divided by just 1 and 266,721, it is not a prime number.