Yep.
Eg 13.4 is divisible by two, so it's even.
13.5, on the other hand, isn't.
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No. A whole number is a number with no fractional (decimal) part. Therefore a decimal number can not be a whole number. Another view: 35.0 is a whole number AND a decimal. The fact that a number is a decimal does not automatically require it to have a fractional part. Even 35 is a decimal number (without a decimal point).
No. Any number that has a decimal place is not an integer. Even if the decimal place is ".0".
If the decimal number can be expressed as a fraction (with one whole number over another), then it is a rational decimal number. So 7/5 is a rational number, and remains as such even if expressed in decimal form (of 1.4).
Depends on what you mean. The first even number can be 0.2 or lesser. If you do not include decimal points, then I think zero is the first even number.
Yes - any number without a decimal portion - even a negative number - is a whole number.