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Yep, any rational number squared is also rational.

Q: Is the number 36 squared in the set of rational numbers?

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No. A real number is only one number whereas the set of rational numbers has infinitely many numbers. However, the set of real numbers does contain the set of rational numbers.

No, a number is either rational or irrational

The set of rational numbers is the union of the set of fractional numbers and the set of whole numbers.

The sum of any finite set of rational numbers is a rational number.

It is the set of rational numbers.

A rational number is not. But the set of ALL rational numbers is.

56 is a rational whole natural number. Or to put it another way: 56 is a Natural number, but as all natural numbers are also whole numbers 56 is also a whole number, but as all whole numbers are also rational numbers 56 is also a rational number. Natural numbers are a [proper] subset of whole numbers; Whole numbers are a [proper] subset of rational numbers. The set of rational numbers along with the set of irrational numbers make up the set of real numbers

The set of rational numbers is represented by Q.

Some rational numbers are whole numbers, some are not. The set of whole numbers is a proper subset of rational numbers.

Natural numbers are a part of rational numbers. All the natural numbers can be categorized in rational numbers like 1, 2,3 are also rational numbers.Irrational numbers are those numbers which are not rational and can be repeated as 0.3333333.

The set of rational numbers is a subset of the set of real numbers. That means that every rational number is a real number, but not every real number is rational. The square root of 2 is an example of a real number that isn't rational; that is, it can't be expressed as the quotient of two integers.

There are rational numbers and irrational numbers. Real numbers are DEFINED as the union of the set of all rational numbers and the set of all irrational numbers. Consequently, all rationals, by definition, must be real numbers.