Why for every range of N numbers, there are always approximately 0.392*N numbers which contains perfect squares as factors?

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As to my current understanding, when simplifying radicands of roots what we are really doing is checking if this said number contains a perfect square number as a factor. Studying the distribution of those cases I noticed that for every range of N numbers there will always be approximately 0,392 * N numbers that has as one of its factors at least one perfect square. Why is this? This probably has some very obvious "analytical motive" behind and I would appreciate very much to learn which it is. Thanks!