Measuring PuzzlesStarter PuzzlesPuzzle GamesLogic PuzzlesJigsaw PuzzlesNumber PuzzlesCard PuzzlesEinstein PuzzlesSam Loyd PuzzlesAlgebra Puzzles
Four-Digit Whole Number Puzzle
The Puzzle:
There is one four-digit whole number n, such that the last four digits of n2 are in fact the original number n.
Do you have the answer? Check against our solution!