Q: Is 21,980 a Prime Number?
A: No, 21,980 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 21980 can be evenly divided by 1 2 4 5 7 10 14 20 28 35 70 140 157 314 628 785 1,099 1,570 2,198 3,140 4,396 5,495 10,990 and 21,980, with no remainder.
Since 21,980 cannot be divided by just 1 and 21,980, it is not a prime number.