Q: Is 21,210 a Prime Number?
A: No, 21,210 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 21210 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 30 35 42 70 101 105 202 210 303 505 606 707 1,010 1,414 1,515 2,121 3,030 3,535 4,242 7,070 10,605 and 21,210, with no remainder.
Since 21,210 cannot be divided by just 1 and 21,210, it is not a prime number.