2.5 is not a natural number.
as rational numbers are divided into Integers and Fractions
2.5=5/2 which is a fraction
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Yes
All of them except irrational number.
The positive square root is.
1, 2, 4, 5, 10, 20, 25, 50, 100
By the property of uniqueness, number 25 is 25 and only 25, no other number.