The question displayed in the image asks about the type of number $\sqrt{2}$. The options provided are:

1. Integer
2. Rational Number
3. Irrational Number
4. Whole Number

The correct answer is:

Irrational Number

Here's why: $\sqrt{2}$ is a number that cannot be expressed as a fraction of two integers (i.e., $\frac{p}{q}$ where $p$ and $q$ are integers, and $q \neq 0$). The decimal representation of $\sqrt{2}$ is non-repeating and non-terminating. Therefore, it is classified as an irrational number.

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Here are five related questions to expand on this information:

1. What is the difference between rational and irrational numbers?
2. Can $\sqrt{3}$ be classified as an integer, rational, or irrational number?
3. How do you prove that $\sqrt{2}$ is irrational?
4. Are all square roots of non-perfect squares irrational numbers?
5. How can you identify if a given decimal is rational or irrational?

Tip: Any non-perfect square root will result in an irrational number because it cannot be expressed as a simple fraction.