If m is a positive integer and m^2 is divisible by 39, then the largest positive integer that must divide m is?  Choose the correct answer:  A) 3  B) 6  C) 8  D) 12  E) 13
M^2 is divisible by 48 so M^2 must be multiple of 48.   If the value of M is Multiples of 13 then it will satisfy the condition. If we If M is 12 or 24 or 36 then it ans is E but if M = 39 then answer should be 16.   Is the question right? Or am i missing some thing?   13
<result>E</result>
If m is a positive integer and m^2 is divisible by 39, then the largest positive integer that must divide m is?