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Question: What is Rational Number ?

Answer:

Any number which can be expressed in the form p/q where p and q are positive or negative whole numbers is called rational.

For example
2/3, 3/5, -5/7, 49/-56 are rational numbers

The natural numbers and integers are subsets of the rational numbers, which is easily seen by putting q = 1

Any terminating or recurring decimal can be written as a rational number

For example, 37.2567 = 372567/1000099 and 0.1313131313... = 13/99
But numbers like √2, and √3 and π cannot be expressed as rational numbers and are called irrational.