Square numbers
A square number is a number multiplied by itself. The symbol is 2 (we call it exponent). The number squared is called the base:
$$2^2= 2 × 2 = 4$$
$$3^2 = 3 × 3 = 9$$
$$4^2 = 4 × 4 = 16$$
We can read this as two/three/four to the second power.
A cube number is a number multiplied by itself 3 times:
$$2^3 = 2 × 2 × 2 = 8$$
$$3^3 = 3 × 3 × 3 = 27$$
