A number that can be written as a square root that does not result in a whole number determines whether a number is **irrational**.

### What is an irrational number?

An **irrational number** is a number the square root of a number that does have a perfect square. When it is written in decimal form, the decimals do not repeat and will not terminate.

An **irrational number** does not terminate nor does it repeat.

We are given options, from which we must choose what best describes an **irrational number**.

The statement that best describes an **irrational number** is "A number that can be written as a square root that does not result in a whole number".

This is true, as the decimal places of such a square root would have no repeating decimals or terminations.

Therefore, we have found that the statement "A number that can be written as a square root that does not result in a whole number" determines whether a number is **irrational**. The correct answer is **option A**.

Learn more about **irrational numbers** here: brainly.com/question/2236338

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