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binary system
A one digit number is a number with only one number. For example: 12 is a two digit number. It has two numbers. 3 is a one digit number because it only has one number.
6 is the only single digit perfect number.
A digit in math is a component of a natural number which is less than the base of the number system you are using. Natural numbers are all of the non-negative integers, sometimes including zero. So in the decimal number system, which has a base of 10, a digit is any number from 0 to 9. If you are using the binary number system, which has a base of 2, a digit can only be a 0 or a 1. If you are using the hexadecimal number system, which has a base of 16, a digit is any number from 0 to 15 (the numbers 10-15 are generally represented as A, B, C, D, E, F). If you are using the Sexagesimal number system, which has a base of 60, a digit is any number from 0 to 59. This is the number system which the Babylonians used, which is one of the reasons why we divide an hour into 60 minutes, and a minute into 60 seconds. This is also why we have 360 degrees to a circle.
Nothing in this universe: 16,25,36,49,64 & 81 are the only 2-digit squares.