How do you write a squared number on a calculator?

To write a squared number on a calculator, you can typically use the exponentiation function. Enter the base number, then press the exponent button (often labeled as "^", "x²", or "y^x"), followed by 2 to indicate squaring the number. Finally, press the equals key to get the result. Some calculators may also allow you to use a dedicated square button for quick calculations.