How many hex digits are required represent decimal numbers up to 1 million?

Oh, that's a wonderful question! To represent decimal numbers up to 1 million in hexadecimal, you would need about 4 hex digits. Hexadecimal is base 16, so each digit can represent 16 different values (0-9 and A-F), making it an efficient way to represent large numbers in a compact form. Just imagine those beautiful hex digits coming together like little puzzle pieces to create the number 1 million - what a happy little number!