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Negative rational numbers are used in the same way that negative whole numbers are used: they are simply the additive inverses of their positive counterparts.
we have 7 days in a week. 7 is a prime number. there are 31 days in some months.31 is a prime number
Decimals are used to describe parts of a number, something in between two whole numbers. Tenths, halves, eights etc. But 108 is only whole numbers, so there's nothing there to use a decimal for.
GCF doesn't apply to fractions, only to whole numbers. When those numbers are the numerator and denominator of a fraction, the GCF can be used to reduce it to its simplest form.