Q: Is 21,465 a Prime Number?
A: No, 21,465 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 21465 can be evenly divided by 1 3 5 9 15 27 45 53 81 135 159 265 405 477 795 1,431 2,385 4,293 7,155 and 21,465, with no remainder.
Since 21,465 cannot be divided by just 1 and 21,465, it is not a prime number.