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Q: Is the ratio 21 an integer or an irrational number?

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No. The square root of an integer is either an integer, or an irrational number.

Yes. The square root of a natural number (positive integer) is either an integer, or an irrational number.

Any number that is presented as an integer "over" (aka divided by) an integer is automatically a rational number - that's what the definition of a rational number is.

No - numbers are neither irrational nor rational.Ans 2Well, it is true that 21 is not irrational.As to being rational, every integer is rational.Proof : Take an integer n, add it to itself.Now look at (n+n)/2. It is obviously rational, but equally obviously it reduces to n.

21 is a rational number.

irrational

It is equal to 21/2 which is a rational number

21 is not the square of an integer. The closest square number is 25.

Yes, albeit an irrational number

The nearest whole number (integer) is 21.

the square root of 21

An example of an integer is... - 4 is the opposite of 4, 21 is the opposite of - 21.

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