Question 352007
any number has a power of 1.  When you multiply two same numbers you add the powers :  2*2={{{2^1*2^1=2^(1+1)=2^2}}}
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So in your case

5*5*5*5*5*5={{{5^1*5^1*5^1*5^1*5^1*5^1=5^(1+1+1+1+1+1)=5^6}}}