you can do more stuff after you click =. you can also click = multiple times. when typing square numbers click square button first then your number then =. decimals like pi only goes up to 3.141593 because of scratch only allowing 6 digits in a decimal however you can do whatever.
I'm really surprised on how this turned out as I've never really dealt with numbers in this way there are 2 Easter eggs so try and find them. or go into the code I don't care >:|