The square root of 4 is 2, so it's square root is a whole number, which means the four is a perfect square. Another example of a perfect square is 9. The square root of 9 is 3. The square root is a whole number which means that 9 is a perfect square.
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ANSWER:
whole number
Step-by-step explanation:
The square root of 4 is 2, so it's square root is a whole number, which means the four is a perfect square. Another example of a perfect square is 9. The square root of 9 is 3. The square root is a whole number which means that 9 is a perfect square.