Answer
Prime number
Work Step by Step
A $\textit{prime}$ number is a natural number greater than $1$ which has only two factors: $1$ and the number itself. In case it has more than two factors, it is a $\textit{composite}$ number.
In order to determine if the given number is prime, we determine its factors.
$13=1\cdot 13$.
Because $13$ is divisible only by $1$ and itself, it follows that it is a prime number.
