A **square-free integer** is an integer that is not divisible by the square of any prime number. In other words, a square-free integer cannot have any prime factor raised to a power greater than one in its prime factorization. For example: - The integer 30 is square-free because its prime factorization is \(2^1 \times 3^1 \times 5^1\); none of the prime factors are squared or higher.
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