9641, 8542, 8471, 7631, 6310

• 6310 is odd.
  
  Other numbers are obtained by multiplying two prime numbers
  whereas
  6310 is obtained by multiplying 3 prime numbers.
  like
  9641 = 31*311
  8542 = 2*4271
  8471 = 43*197
  7631 = 13*587
  6310= 2*5*631
• 12 years agoHelpfull: Yes(2) No(1)
• @ vignesh,
  
  Is it logical ?
• 12 years agoHelpfull: Yes(2) No(1)
• Odd Man = 8471.
  
  Logic = Digits are arranged in Descending order in all except 8471 :)
• 12 years agoHelpfull: Yes(1) No(2)