There is no way to determine the amount of perfect numbers there are. The number could be infinite, but this has yet to be proven. It has also yet to be proven if there are any odd perfect numbers.
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There are 31 perfect square numbers between 1 and 1000 (including 1).
6 and 28 are perfect numbers.
The only perfect number between 20 and 50 is 28.
Infinitely many. There are a 100 perfect squares.
81. They are the perfect squares of numbers starting from 5.81. They are the perfect squares of numbers starting from 5.81. They are the perfect squares of numbers starting from 5.81. They are the perfect squares of numbers starting from 5.