# Prime factorization of $1990$

The calculator will find the prime factorization of $1990$, with steps shown.

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Find the prime factorization of $1990$.

### Solution

Start with the number $2$.

Determine whether $1990$ is divisible by $2$.

It is divisible, thus, divide $1990$ by ${\color{green}2}$: $\frac{1990}{2} = {\color{red}995}$.

Determine whether $995$ is divisible by $2$.

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

The next prime number is $3$.

Determine whether $995$ is divisible by $3$.

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

The next prime number is $5$.

Determine whether $995$ is divisible by $5$.

It is divisible, thus, divide $995$ by ${\color{green}5}$: $\frac{995}{5} = {\color{red}199}$.

The prime number ${\color{green}199}$ has no other factors then $1$ and ${\color{green}199}$: $\frac{199}{199} = {\color{red}1}$.

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: $1990 = 2 \cdot 5 \cdot 199$.

The prime factorization is $1990 = 2 \cdot 5 \cdot 199$A.