Explanation:

To solve this problem, let's first determine the values of the four smallest consecutive odd numbers, which are \(a = 1\), \(b = 3\), \(c = 5\), and \(d = 7\).

1. Calculate the sum of these numbers:

$$

a + b + c + d = 1 + 3 + 5 + 7 = 16

$$

2. We want to multiply this sum by a minimum number to make it a perfect square.

3. Since 16 is already a perfect square (it's \(4^2\)), the minimum multiplication factor is \(\boxed{1} \).

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