To factor the expression \( 5p + 15 \), we can look for the greatest common factor (GCF) of the terms.
The GCF of \( 5p \) and \( 15 \) is \( 5 \).
Now, we can factor out \( 5 \) from both terms:
\[ 5p + 15 = 5(p + 3) \]
Therefore, the expression factored as a product with a whole number greater than 1 is:
\[ 5(p + 3) \]