Q: Is 21,660 a Prime Number?
A: No, 21,660 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 21660 can be evenly divided by 1 2 3 4 5 6 10 12 15 19 20 30 38 57 60 76 95 114 190 228 285 361 380 570 722 1,083 1,140 1,444 1,805 2,166 3,610 4,332 5,415 7,220 10,830 and 21,660, with no remainder.
Since 21,660 cannot be divided by just 1 and 21,660, it is not a prime number.