Q: Is 21,402 a Prime Number?
A: No, 21,402 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 21402 can be evenly divided by 1 2 3 6 9 18 29 41 58 82 87 123 174 246 261 369 522 738 1,189 2,378 3,567 7,134 10,701 and 21,402, with no remainder.
Since 21,402 cannot be divided by just 1 and 21,402, it is not a prime number.