Some measurements have units associated with them: for example feet or metres or grams etc. But not necessarily.
yes
precise but unreliable.
5 and 6
5.0
Every tow consecutive odd or even numbers differ by two.
2 and 5 are the only prime numbers which differ by 3.
yes
Apparently, women's clothes sizes are in even numbers because of standardized measurements. When you cut cloth, you can standardize the measurements.
Then they have precision but not accuracy.
Two prime numbers which differ by 2 are called "twin primes".
A quantitAtive observation
scalar measurements differ from vector measurements in that scalar measurements have no directionality. Example: If a car travels in a circle with a circumference of 25m it will have travelled: distance (scalar): 25 m displacement (vector): 0m