How many ways can you fill a $3 \times 3$ square grid with nonnegative integers such that no [i]nonzero[/i] integer appears more than once in the same row or column and the sum of the numbers in every row and column equals 7?
1. **Understanding the Problem:**
   We need to fill a \(3 \times 3\) grid with nonnegative integers such that:
   - No nonzero integer appears more than once in the same row or column.
   - The sum of the numbers in every row and column equals 7.

2. **Binary Representation and Subsets:**
   Represent each number in binary and consider them as subsets of \(\{1, 2, 3\}\). For example:
   - \(1\) can be represented as \(\{1\}\)
   - \(2\) can be represented as \(\{2\}\)
   - \(3\) can be represented as \(\{3\}\)
   - \(4\) can be represented as \(\{1, 2\}\)
   - \(5\) can be represented as \(\{1, 3\}\)
   - \(6\) can be represented as \(\{2, 3\}\)
   - \(7\) can be represented as \(\{1, 2, 3\}\)

3. **Partitioning Subsets:**
   We need to place subsets of \(\{1, 2, 3\}\) in the cells of a \(3 \times 3\) grid such that in each row and column, the subsets form a partition of \(\{1, 2, 3\}\). This means each row and column must contain exactly one of each element from \(\{1, 2, 3\}\).

4. **Bijection to Permutations:**
   We can think of placing three 1s, three 2s, and three 3s in the grid such that there is exactly one of each number in every row and column. This is equivalent to finding the number of ways to arrange these numbers in the grid.

5. **Counting Permutations:**
   Each row must contain one 1, one 2, and one 3. The number of ways to arrange 1, 2, and 3 in a row is \(3!\). Since there are three rows, and each row must independently satisfy this condition, the total number of ways to arrange the numbers in the grid is \((3!)^3\).

6. **Calculation:**
   \[
   (3!)^3 = 6^3 = 216
   \]

Conclusion:
\[
\boxed{216}
\]