Perfect square numbers are integers that are the square of an integer. In other words, a perfect square is a number that can be expressed as the product of an integer with itself. Here are the first 10 perfect square numbers:
1. 1 (1 × 1)
2. 4 (2 × 2)
3. 9 (3 × 3)
4. 16 (4 × 4)
5. 25 (5 × 5)
6. 36 (6 × 6)
7. 49 (7 × 7)
8. 64 (8 × 8)
9. 81 (9 × 9)
10. 100 (10 × 10)
These numbers are called perfect squares because they can be arranged into a perfect square shape. For example, 9 can be arranged into a 3×3 grid, forming a perfect square.