It is usually a vector and is a number which has a direction associated with it. Velocity is an example of a directed number. The velocity of an object is not only its speed (distance/time) but also the direction of travel. Acceleration, force are other common vectors.
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A number? ^^
x4
the number in the middle
the number you divide with
If you mean a 'prime number', then it is a number that cannot be divided into a smaller number without becoming a decimal