Squarefree

A positive integer is squarefree if it is not divisible by any perfect square greater than one.

Squarefree is a college-level concept that would be first encountered in a number theory course.

Prerequisites

Divisor:	An integer that divides a given integer with no remainder. A synonym for factor.
Prime Factorization:	Prime factorization is the factorization of a number into its constituent primes. Also called prime decomposition.
Square Number:	A square number is an integer that is the square (i.e., second power) of another integer.

Classroom Articles on Number Theory (Up to College Level)

	Congruence	Partition
	Continued Fraction	Perfect Number
	Convergent	Prime Counting Function
	Diophantine Equation	Prime Factorization Algorithms
	Divisor Function	Prime Number Theorem
	Euclidean Algorithm	Quadratic Reciprocity Theorem
	Euler-Mascheroni Constant	Totient Function
	Fermat's Last Theorem	Transcendental Number
	Number Theory