The sequence $\{y_{n}\}_{n \ge 1}$ is defined by \[y_{1}=y_{2}=1,\;\; y_{n+2}= (4k-5)y_{n+1}-y_{n}+4-2k.\] Determine all integers $k$ such that each term of this sequence is a perfect square.
1. The sequence $\{y_{n}\}_{n \ge 1}$ is defined by the initial conditions \( y_{1} = y_{2} = 1 \) and the recurrence relation:
   \[
   y_{n+2} = (4k-5)y_{n+1} - y_{n} + 4 - 2k
   \]
   We need to determine all integers \( k \) such that each term of this sequence is a perfect square.

2. First, we calculate the third term \( y_3 \) using the recurrence relation:
   \[
   y_3 = (4k-5)y_2 - y_1 + 4 - 2k = (4k-5) \cdot 1 - 1 + 4 - 2k = 4k - 5 - 1 + 4 - 2k = 2k - 2
   \]
   For \( y_3 \) to be a perfect square, \( 2k - 2 \) must be a perfect square. Let \( 2k - 2 = m^2 \) for some integer \( m \). Then:
   \[
   2k = m^2 + 2 \implies k = \frac{m^2 + 2}{2}
   \]
   Since \( k \) must be an integer, \( m^2 + 2 \) must be even, implying \( m \) must be even. Let \( m = 2t \) for some integer \( t \). Then:
   \[
   k = \frac{(2t)^2 + 2}{2} = 2t^2 + 1
   \]

3. Next, we calculate the fifth term \( y_5 \) using the recurrence relation:
   \[
   y_4 = (4k-5)y_3 - y_2 + 4 - 2k = (4k-5)(2k-2) - 1 + 4 - 2k
   \]
   Substituting \( k = 2t^2 + 1 \):
   \[
   y_4 = (4(2t^2 + 1) - 5)(2(2t^2 + 1) - 2) - 1 + 4 - 2(2t^2 + 1)
   \]
   Simplifying:
   \[
   y_4 = (8t^2 - 1)(4t^2) - 1 + 4 - 4t^2 - 2 = 32t^4 - 4t^2 - 1 + 4 - 4t^2 - 2 = 32t^4 - 8t^2 + 1
   \]

4. We then calculate \( y_5 \):
   \[
   y_5 = (4k-5)y_4 - y_3 + 4 - 2k
   \]
   Substituting \( y_4 = 32t^4 - 8t^2 + 1 \) and \( y_3 = 2k - 2 = 4t^2 \):
   \[
   y_5 = (8t^2 - 1)(32t^4 - 8t^2 + 1) - 4t^2 + 4 - 4t^2 - 2
   \]
   Simplifying:
   \[
   y_5 = 256t^6 - 96t^4 + 8t^2 + 1
   \]

5. We need \( y_5 \) to be a perfect square. Consider the inequality:
   \[
   (16t^3 - 3t - 1)^2 < 256t^6 - 96t^4 + 8t^2 + 1 < (16t^3 - 3t)^2
   \]
   Expanding both sides:
   \[
   (16t^3 - 3t - 1)^2 = 256t^6 - 96t^4 + 8t^2 + 1 - 6t^2 + 9t^2 + 1
   \]
   \[
   (16t^3 - 3t)^2 = 256t^6 - 96t^4 + 9t^2
   \]
   Since \( 256t^6 - 96t^4 + 8t^2 + 1 \) is not a perfect square for \( t \geq 2 \), we conclude that \( k \leq 3 \).

6. We now check the cases \( k = 1, 2, 3 \):
   - For \( k = 1 \):
     \[
     y_{n+2} = -y_{n+1} - y_{n} + 2
     \]
     The sequence does not consist of perfect squares.
   - For \( k = 2 \):
     \[
     y_3 = 2k - 2 = 2 \cdot 2 - 2 = 2
     \]
     \( y_3 \) is not a perfect square.
   - For \( k = 3 \):
     \[
     y_{n+2} = 7y_{n+1} - y_{n} - 2
     \]
     We need to show that \( y_n \) is a perfect square for all \( n \geq 1 \).

7. Denote \( a_n = y_n - \frac{2}{5} \). Then:
   \[
   a_{n+2} = 7a_{n+1} - a_{n}
   \]
   Solving the characteristic equation:
   \[
   \lambda^2 - 7\lambda + 1 = 0
   \]
   The roots are:
   \[
   \lambda_1 = \frac{7 + 3\sqrt{5}}{2}, \quad \lambda_2 = \frac{7 - 3\sqrt{5}}{2}
   \]
   Thus:
   \[
   a_n = c_1 \lambda_1^n + c_2 \lambda_2^n
   \]
   Using initial conditions \( a_1 = a_2 = \frac{3}{5} \), we find:
   \[
   c_1 = \frac{9 - 4\sqrt{5}}{5}, \quad c_2 = \frac{9 + 4\sqrt{5}}{5}
   \]
   Therefore:
   \[
   a_n = \left( \frac{\sqrt{5} - 2}{\sqrt{5}} \left( \frac{3 + \sqrt{5}}{2} \right)^n \right)^2 + \left( \frac{\sqrt{5} + 2}{\sqrt{5}} \left( \frac{3 - \sqrt{5}}{2} \right)^n \right)^2
   \]
   \[
   y_n = \left( \frac{\sqrt{5} - 2}{\sqrt{5}} \left( \frac{3 + \sqrt{5}}{2} \right)^n + \frac{\sqrt{5} + 2}{\sqrt{5}} \left( \frac{3 - \sqrt{5}}{2} \right)^n \right)^2 = x_n^2
   \]

8. We show that \( x_{n+2} = 3x_{n+1} - x_{n} \) for all \( n \geq 1 \) and \( x_1 = x_2 = 1 \). Therefore, \( x_n \in \mathbb{N} \) for all \( n \geq 1 \) and \( y_n = x_n^2 \).

The final answer is \( \boxed{ k = 1 } \) and \( k = 3 \).