No. A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. If it does not contain a fractional part then the decimal representation does not require a decimal point. So, for example, 547 is a decimal number as well as an integer.
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No.
Every integer is a rational number.
Whole number means the same thing as integer and does not have a fraction or decimal part. Rational numbers can be expressed as a ratio of whole numbers.
A rational number which is an integer can be simplified to a form in which the denominator is 1. That is not possible for a rational number which is not an integer.
A rational number is either an integer or a fraction.