There are no such numbers since any number can be written as a quotient of itself and 1. For example, pi = pi/1
A quotient of two numbers cannot have a denominator which is zero: such a fraction is not defined.
Any positive number can be written as a quotient of two positive numbers or a quotient of two negative numbers. Any real number can be written as the quotient of two real numbers.
A quotient is a binary operation. That means, you can calculate the quotient of two numbers. There cannot be a quotient of only one number.
Rational numbers
A quotient is the result of a division sum between two or more numbers. You cannot have a quotient of a single number.
Every number can be written as a quotient.Every rational number can be written as a quotient of whole numbers.
Pi
None. A rational number is a number that can be written as the quotient of two integers where the divisor is not zero. An irrational number is a real number that cannot be written as the quotient of two integers where the divisor is not zero. Any given real number either can or cannot be written as the quotient of two integers. If it can, it is rational. If it cannot, it is irrational. You can't be both at the same time. The square root of -1 is not a real number and it cannot be written as the quotient of two integers, so it is neither rational nor irrational.
They are rational fractions.
None. If the two numbers have a quotient of 9 then one of them must be 9 times as large as the other. In that case, their difference cannot be 0.
That's an 'irrational' number.