Unfortunately, we don’t have a template for real numbers as is the case for rational numbers.
Real Numbers are the union of Rational Numbers and Irrational Numbers.
We can’t write down a complete number for an irrational number like the square root of two.
However, we argue it exists because a right triangle with sides of length 1 has a hypotenuse with a length of the square root of two.
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Any integer qualifies as being a rationak number.