Input: nums = [4,3,6,16,8,2]

Output: 3

Explanation: Choose the subsequence [4,16,2]. After sorting it, it becomes [2,4,16].

- 4 = 2 * 2.

- 16 = 4 * 4.

Therefore, [4,16,2] is a square streak.

It can be shown that every subsequence of length 4 is not a square streak.