Q: Is 28,431 a Prime Number?
A: No, 28,431 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 28431 can be evenly divided by 1 3 9 13 27 39 81 117 243 351 729 1,053 2,187 3,159 9,477 and 28,431, with no remainder.
Since 28,431 cannot be divided by just 1 and 28,431, it is not a prime number.