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Japt, (削除) 10 (削除ここまで) 7 bytes

Saved 3 bytes thanks to @Luke and @ETHproductions

*8Ä ¬v1

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##Explanation: *8Ä ¬v1 ¬ // Square root of: *8 // Input * 8 Ä // +1 v1 // Return 1 if divisible by 1; Else, return 0

###10-byte Solution:

õ å+ aU >J

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##Explanation: õ å+ aU >J õ // Create a range from [1...Input] å+ // Cumulative reduce by addition aU // Return the last index of the input >J // > -1