Find the Missing Digit: Complete _2 to Make a Prime Number

To solve the problem of finding the missing digit in $\square2$ that results in a prime number, we need to check each possible digit from $0$ to $9$ and see which of them make $\square2$ a prime number.

Let's perform this step-by-step analysis:

• Step 1: Substitute $0$ in place of $\square$, resulting in the number $02$ which should be considered as $2$.
• Step 2: Check if the number $2$ is a prime number. A prime number is one that has no divisors other than $1$ and itself.
• Step 3: Determine if $2$ is prime. Since $2$ is divisible by only $1$ and $2$, it is a prime number.

Upon examining the possibilities, the use of $0$ in $\square$ results in $02$, which is equal to $2$, a prime number. Therefore, the missing digit that makes $\square2$ a prime number is $0$.

Thus, the correct number is $02$ or $2$, and therefore the correct choice from the given options is $0$.