Which of the following is od a perfect square?
(171)(_{8})
(14.641)(_{8})
(61)(_{8})
(58)(_{8})

( (171)_{8}=1(8)^{2}+7(8)+1=64+56+1=121=(11)^{2} )
( (61)_{8}=6(8)+1=48+1=49=(7)^{2} )
( (58)_{8}=5(8)+8=40+8=48 ) not a perfect squall
option (D) is correcte.