Q: Is 21,972 a Prime Number?
A: No, 21,972 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 21972 can be evenly divided by 1 2 3 4 6 12 1,831 3,662 5,493 7,324 10,986 and 21,972, with no remainder.
Since 21,972 cannot be divided by just 1 and 21,972, it is not a prime number.