The total number of two digit number which contain only the 3 factors (including 1) will be?

• all the square of prime no.have exactly 3 factors.
  in ques it is asked abt 2 digit no.
  25 and 49 are the square of a prime nos.5 and 7 respectively.no other square of a prime no.is a 2 digit no.
• 11 years agoHelpfull: Yes(3) No(1)
• the total no will be 2
• 11 years agoHelpfull: Yes(2) No(1)
• Can anyone explain this question.....
  
• 11 years agoHelpfull: Yes(2) No(0)
• all square numbers have odd number of factors only...here we have 25,49 only.. so 2 numbers
• 11 years agoHelpfull: Yes(2) No(0)
• What about 81
• 8 years agoHelpfull: Yes(0) No(0)