2 added 543 characters in body
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C (gcc), 30 bytes

f(n){n=sqrt(n)==(int)sqrt(n);}

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C, 34 bytes

f(n){return(int)sqrt(n)==sqrt(n);}

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C, 33 bytes

#define f(n)(int)sqrt(n)==sqrt(n)

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C (gcc), 30 bytes

f(n){n=sqrt(n)==(int)sqrt(n);}

Try it online!

C (gcc), 30 bytes

f(n){n=sqrt(n)==(int)sqrt(n);}

Try it online!

C, 34 bytes

f(n){return(int)sqrt(n)==sqrt(n);}

Try it online!

C, 33 bytes

#define f(n)(int)sqrt(n)==sqrt(n)

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1
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C (gcc), 30 bytes

f(n){n=sqrt(n)==(int)sqrt(n);}

Try it online!