No, it is usually not.
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Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. All natural and whole numbers are rational.
a rational number is different from a natural number because a rational number can be expressed as a fraction and natural numbers are just countinq numbers =D
Try 1/2. It's rational - a fraction - but it's not a natural (whole) number. There are so many, like .35, or .2423897189027, or 9.3, or 1.33333333333333... or 1.142857142857...
Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. All natural numbers are rational.
2/5 are prime, 8/15 are composite (and 1/15 is neither).