Which statements are true about irrational numbers?

Select all that apply.
1. They are not real numbers.

2.Their decimal form contains a bar over one or more decimal numbers to show that they continue on infinitely.

3.They can be the square root of a non-perfect square.

4.They can be written as simple fractions.

5. Their decimal form contains an ellipsis, 3 dots, to show that they continue on infinitely.