a monomial itself is not a real number because it ia a vocabulary term, however, real numbers and vairables can be monmials.
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A monomial that is a real number is called a constant.
That's the difference of the monomials' squares. If the two numbers are "a" and "b" then (a + b)(a - b) = a^2 - b^2 where ^ means "to the power of".
A polynomial.
Two monomials would be a Binomial or Polynomial.
The product of monomials is a single term.