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~a=string.(0:a.^2);!a=any(~a'~(0:a)'.*~a*~(0:a).=="$a")
Try it online!Try it online!
Golfing furtherBased on MarcMush’s answer (tnx for pointing out the error when squaring)
~a=string.(0:a);!a=any(~a'.*~a.=="$a")
Try it online!
Golfing further MarcMush’s answer
~a=string.(a.^2);!a=any(~(0:a)'.*~(0:a).=="$a")
Based on MarcMush’s answer (tnx for pointing out the error when squaring)
