Question

A few numbers are written on the board. Daphne says that only $2$ of them are prime numbers. Is she correct?

• A. Yes, there are only $2$ prime numbers
• B. No, there is only $1$ prime number
• C. No, all $4$ are prime numbers
• D. No, there are $3$ prime numbers

Answer 1

The correct option is B No, there is only $1$ prime number

A prime number is a number that has exactly two factors, i.e., $1$ and the number itself.

• $23$ is the only number that has two factors, $1$ and $23$.