Q: Is 21,436 a Prime Number?
A: No, 21,436 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 21436 can be evenly divided by 1 2 4 23 46 92 233 466 932 5,359 10,718 and 21,436, with no remainder.
Since 21,436 cannot be divided by just 1 and 21,436, it is not a prime number.