Question

From $\text{1 and 100}$, list the numbers that have exactly three factors?

Answer 1

Factor: A Factor of a number is an exact divisor of that number.

$$\begin{gathered} 4\to 1,2,4 \\ 9\to 1,3,9 \\ 25\to 1,5,25 \\ 49\to 1,7,49 \end{gathered}$$

Hence, the numbers are $4,9,25,49$