False ,(Consider the rational numbers and whole numbers separately.
We know that rational numbers are the numbers that can be written in the form p/q where q ≠ 0.
We know that whole number series is 0,1, 2, 3, 4,5..... .
We know that every number of whole number series can be written in the form of p/q as 0/1,1/1,2/1,3/1,4/1,5/ .... .
We conclude that every number of the whole number series is a rational number.
But, every rational number does not appear in the whole number series.
Therefore, we conclude that every rational number is not a whole number.