Can you please help me with this task in sage? [closed]

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1) Enter the program function sum_quadrate() with matrix A.The function returns the sum of those matrix elements that are complete squares. The x is complete square if the command is_square (x) returns the True value.

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matrix A=[1 3 9 ] [2 7 25] ...

def sum_quadrate (A): m=A.nrows() n=A.ncols() True=0 for i in range (m): for j in range(n): if....??? I wrote this but from last row i dont know what goes next