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For n to be a perfect square n = m2 where m can have one of the values 1, 2, 3, ... 1, 2, 3, ... are the counting numbers. There are an infinite number of counting numbers, so there are an infinite number of perfect squares (n = m2).
Well, there is an infinite number of numbers, so technically, there is an infinite amount of prime numbers.
There are an infinite number of them so it is not possible to list them.
There are an infinite amount of numbers, so there can be no "greatest" odd number.
It is more so an expression that numbers never end. But it can be used as a number.