Raise a square matrix to an integer power.
Raising a square matrix \( A \) to a power \( n \) (denoted \( A^n \)) involves multiplying \( A \) by itself \( n \) times. For \( n = 0 \), the result is the identity matrix.
Example: For \( A = \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix} \) and \( n = 2 \), \( A^2 = A \cdot A = \begin{bmatrix} 7 & 10 \\ 15 & 22 \end{bmatrix} \).
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