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Determine whether an integer is square-free
An integer is called square-free if it is not a multiple of a perfect square other than 1. For example, 42 is square-free, but 44 is not because it is a multiple of the perfect square 4 = 2².
Your task is to write a program or function that takes a positive integer, and returns a truthy value if the integer is square-free and a falsey value otherwise.
This is code golf, the shortest code wins.
The square-free numbers are OEIS sequence A005117 (thanks to Razetime for pointing this out).
Some test cases:
1 true
2 true
3 true
4 false
5 true
6 true
7 true
8 false
9 false
10 true
12 false
14 true
16 false
18 false
20 false
30 true
40 false
50 false
100 false
110 true
111 true
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