Square Square

April 10, 2018

We have today an opportunity for some code golf:

Write a program to find a four-digit positive integer that, when multiplied by itself, contains the original four-digit number in the last four digits of the product.

Your task is to write a program to find the desired number. If you wish, you can take it as a challenge to use the minumum number of symbols in your programming language. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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