Find the least number that must be subtracted from 5607 so as to get a perfect square. Also find the square root of the perfect square.find the greatest 4 digit number which is a perfect square .

Explanation

To solve the problem step by step, we will break it down into two parts:

1. Finding the least number that must be subtracted from 5607 to get a perfect square and finding the square root of that perfect square.
2. Finding the greatest four-digit number that is a perfect square.

### Part 1: Finding the least number to subtract from 5607

**Step 1:** Identify the number we need to work with.
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