Find the least square number, exactly divisible by each one of the numbers: 6, 9, 15 and 20

Explanation

To find the least square number that is exactly divisible by each of the numbers 6, 9, 15, and 20, we will follow these steps:

### Step 1: Find the prime factorization of each number.
- **6** = 2 × 3
- **9** = 3 × 3 = 3²
- **15** = 3 × 5
- **20** = 2 × 2 × 5 = 2² × 5

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