Assuming a 3x3 square, yes.
If you want to know a solution where all rows, columns and diagonals sum to 15, it is:
2 9 4
7 5 3
6 1 8
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Assuming you're referring to a 'magic square' one solution would be...
816
357
492
2 7 6 9 5 1 4 3 8
20
Of course. You have a choice of several different lovely arrangements:18 rows with 1 in each row9 rows with 2 in each row6 rows with 3 in each row
63
18 Chairs into equal rows - 6 x 3 2 x 9 18 x 1