Q: Is 221,145 a Prime Number?
A: No, 221,145 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 221145 can be evenly divided by 1 3 5 15 23 69 115 345 641 1,923 3,205 9,615 14,743 44,229 73,715 and 221,145, with no remainder.
Since 221,145 cannot be divided by just 1 and 221,145, it is not a prime number.