Question

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Answer 1

i would say it's a constant function
\[y= \frac{ 1 }{ 4^{5} }\]
\[y= \frac{ 1 }{ 1024 }\]

Answer 2

no, it's not a power function. a power function has the equation
\[y= a x^{b}\]
and this equation does not fit the given equation.