There is the sequence of numbers $1, a_2, a_3, ...$ such that satisfies $1 \cdot a_2  \cdot a_3 \cdot  ...  \cdot a_n = n^2$, for every integer $n> 2$. Determine the value of $a_3 + a_5$.
1. We start with the given sequence \(1, a_2, a_3, \ldots\) such that the product of the first \(n\) terms equals \(n^2\). That is, 
   \[
   1 \cdot a_2 \cdot a_3 \cdot \ldots \cdot a_n = n^2 \quad \text{for every integer } n > 2.
   \]

2. Let \(a_1 = 1\). Then for \(n > 2\), we can express \(a_{n+1}\) in terms of the previous terms:
   \[
   a_{n+1} = \frac{\prod_{i=1}^{n+1} a_i}{\prod_{i=1}^n a_i} = \frac{(n+1)^2}{n^2}.
   \]

3. We need to find the specific values of \(a_3\) and \(a_5\). First, we calculate \(a_3\):
   \[
   1 \cdot a_2 \cdot a_3 = 3^2 = 9 \implies a_3 = \frac{9}{a_2}.
   \]

4. Next, we calculate \(a_5\):
   \[
   a_5 = \frac{5^2}{4^2} = \frac{25}{16}.
   \]

5. Now, we need to find the sum \(a_3 + a_5\):
   \[
   a_3 + a_5 = \frac{9}{a_2} + \frac{25}{16}.
   \]

6. To find the value of \(a_2\), we use the fact that:
   \[
   1 \cdot a_2 = 2^2 = 4 \implies a_2 = 4.
   \]

7. Substituting \(a_2 = 4\) into the expression for \(a_3\):
   \[
   a_3 = \frac{9}{4}.
   \]

8. Finally, we calculate \(a_3 + a_5\):
   \[
   a_3 + a_5 = \frac{9}{4} + \frac{25}{16}.
   \]

9. To add these fractions, we need a common denominator:
   \[
   \frac{9}{4} = \frac{36}{16} \quad \text{and} \quad \frac{25}{16} = \frac{25}{16}.
   \]
   \[
   a_3 + a_5 = \frac{36}{16} + \frac{25}{16} = \frac{61}{16}.
   \]

The final answer is \(\boxed{\frac{61}{16}}\).