Q: Is 221,001 a Prime Number?
A: No, 221,001 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 221001 can be evenly divided by 1 3 11 33 37 111 181 407 543 1,221 1,991 5,973 6,697 20,091 73,667 and 221,001, with no remainder.
Since 221,001 cannot be divided by just 1 and 221,001, it is not a prime number.