Prime factorization of $$$1661$$$
Your Input
Find the prime factorization of $$$1661$$$.
Solution
Start with the number $$$2$$$.
Determine whether $$$1661$$$ is divisible by $$$2$$$.
Since it is not divisible, move to the next prime number.
The next prime number is $$$3$$$.
Determine whether $$$1661$$$ is divisible by $$$3$$$.
Since it is not divisible, move to the next prime number.
The next prime number is $$$5$$$.
Determine whether $$$1661$$$ is divisible by $$$5$$$.
Since it is not divisible, move to the next prime number.
The next prime number is $$$7$$$.
Determine whether $$$1661$$$ is divisible by $$$7$$$.
Since it is not divisible, move to the next prime number.
The next prime number is $$$11$$$.
Determine whether $$$1661$$$ is divisible by $$$11$$$.
It is divisible, thus, divide $$$1661$$$ by $$${\color{green}11}$$$: $$$\frac{1661}{11} = {\color{red}151}$$$.
The prime number $$${\color{green}151}$$$ has no other factors then $$$1$$$ and $$${\color{green}151}$$$: $$$\frac{151}{151} = {\color{red}1}$$$.
Since we have obtained $$$1$$$, we are done.
Now, just count the number of occurences of the divisors (green numbers), and write down the prime factorization: $$$1661 = 11 \cdot 151$$$.
Answer
The prime factorization is $$$1661 = 11 \cdot 151$$$A.