en- is attached to adjectives or nouns to form verbs meaning: 1  to cause (a person or thing) to be in (the place, condition, or state mentioned);  to restrict on all sides, completely:en- + circle â encircle (= to restrict on all sides within a circle).
In mathematics a divisor of an integer n {\displaystyle n} , also called a factor of n {\displaystyle n} , is an integer that can be multiplied by some other integer to produce n {\displaystyle n} .
To make matters even more confusing, the proper divisor is often defined so that and 1 are also excluded. Using this alternative definition, the proper divisors of 6 would then be , , 2, and 3, and the improper divisors would be , , 1, and 6.