Q: Is 21,126 a Prime Number?
A: No, 21,126 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 21126 can be evenly divided by 1 2 3 6 7 14 21 42 503 1,006 1,509 3,018 3,521 7,042 10,563 and 21,126, with no remainder.
Since 21,126 cannot be divided by just 1 and 21,126, it is not a prime number.