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 77,809,423? It is this number: 77809423. The answer is 3. Is 3 in the list of numbers that are never perfect squares (2, 3, 7 or 8)?
Answer: YES, 3 is in the list of numbers that are never perfect squares. The number 77,809,423 is NOT a perfect square and we can stop here as there is not need to complete the rest of the steps.
Number | 77,809,421 | 77,809,422 | 77,809,424 | 77,809,425 |
Perfect Square? | no | no | no | no |