Q: Is 21,516 a Prime Number?
A: No, 21,516 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 21516 can be evenly divided by 1 2 3 4 6 11 12 22 33 44 66 132 163 326 489 652 978 1,793 1,956 3,586 5,379 7,172 10,758 and 21,516, with no remainder.
Since 21,516 cannot be divided by just 1 and 21,516, it is not a prime number.