Prime Number Identification: Which Number Meets Prime Criteria?

Test for divisibility:

• $6$: It is divisible by $2$ and $3$, so it is not a prime number.

• $11$: It is only divisible by $1$ and $11$, making it a prime number.

• $10$: It is divisible by $2$ and $5$, so it is not a prime number.

• $4$: It is divisible by $2$, so it is not a prime number.

Based on the steps above, the number that is a prime number is $11$.