A perfect square is a number that can be expressed as the product of two equal integers.
The only way to accurately calculate if a number is a perfect square is to find the factors. Before we go through the trouble of finding the factors, there is a quick trick you can use to help determine if you need even need to do the extra work.
Try these steps first:
Let's try it...
Step 1:
What is the last number of 21,012,748? It is this number: 21012748. The answer is 8. Is 8 in the list of numbers that are never perfect squares (2, 3, 7 or 8)?
Answer: YES, 8 is in the list of numbers that are never perfect squares. The number 21,012,748 is NOT a perfect square and we can stop here as there is not need to complete the rest of the steps.
Number | 21,012,746 | 21,012,747 | 21,012,749 | 21,012,750 |
Perfect Square? | no | no | no | no |