The given image shows the first four square numbers, which are visualized using squares made of unit blocks. The sequence of the numbers is:

1, 4, 9, 16.

These are the square numbers because they are derived from squaring integers:

• $1^2 = 1$,
• $2^2 = 4$,
• $3^2 = 9$,
• $4^2 = 16$.

To find the next two terms in the sequence, we calculate:

• $5^2 = 25$,
• $6^2 = 36$.

Thus, the next two numbers in the sequence are 25 and 36.

Would you like further explanations or additional help? Here are five follow-up questions for deeper learning:

1. What are the square numbers up to $12^2$?
2. How can you use square numbers to solve geometry problems involving squares?
3. What is the difference between square numbers and cube numbers?
4. How can you determine if a number is a perfect square?
5. What patterns can be observed in the differences between consecutive square numbers?

Tip:

The difference between consecutive square numbers increases by 2 each time (e.g., $4 - 1 = 3$, $9 - 4 = 5$, $16 - 9 = 7$). This is because $n^2 - (n-1)^2 = 2n - 1$.