Answers vary. All the possibilities for the number of rows and columns are listed below. Some of them may not fit into the grid provided.
1 row, 36 columns OR 2 rows, 18 columns OR 3 rows, 12 columns OR 4 rows, 9 columns OR 6 rows, 6 columns OR 9 rows, 4 columns OR 12 rows, 3 columns OR 18 rows, 2 columns OR 36 rows, 1 column
The area is 16 square units.
The area is 42 square units.
The area is 20 square units.
The area is 24 square units.
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