Prime factorization of $$$2945$$$

Find the prime factorization of $$$2945$$$.

Start with the number $$$2$$$.

Determine whether $$$2945$$$ is divisible by $$$2$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$3$$$.

Determine whether $$$2945$$$ is divisible by $$$3$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$5$$$.

Determine whether $$$2945$$$ is divisible by $$$5$$$.

It is divisible, thus, divide $$$2945$$$ by $$${\color{green}5}$$$: $$$\frac{2945}{5} = {\color{red}589}$$$.

Determine whether $$$589$$$ is divisible by $$$5$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$7$$$.

Determine whether $$$589$$$ is divisible by $$$7$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$11$$$.

Determine whether $$$589$$$ is divisible by $$$11$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$13$$$.

Determine whether $$$589$$$ is divisible by $$$13$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$17$$$.

Determine whether $$$589$$$ is divisible by $$$17$$$.

Since it is not divisible, move to the next prime number.

The next prime number is $$$19$$$.

Determine whether $$$589$$$ is divisible by $$$19$$$.

It is divisible, thus, divide $$$589$$$ by $$${\color{green}19}$$$: $$$\frac{589}{19} = {\color{red}31}$$$.

The prime number $$${\color{green}31}$$$ has no other factors then $$$1$$$ and $$${\color{green}31}$$$: $$$\frac{31}{31} = {\color{red}1}$$$.

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: $$$2945 = 5 \cdot 19 \cdot 31$$$.

The prime factorization is $$$2945 = 5 \cdot 19 \cdot 31$$$A.