The whole number square roots from 1 to 20 are ,,, and .Not all numbers will have whole number square roots. For example, 1 has a square root because 1 can be expressed as the product of two equal integers, 1ｘ1. 4 has a whole number square root because it can be expressed as the product of 2ｘ2. However, notice how 2 and 3 will not have whole number square roots. 2 cannot be expressed as an integer multiplied by itself. Similarly, 3 cannot be expressed as an integer multiplied by itself.