K is square integer

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gmat740: MBA Student; Posts: 1194; Joined: Sat Aug 16, 2008 9:42 pmFollowed by: 17 members; Location: Paris, France; Thanked: 71 times; GMAT Score:710

by gmat740 » Sat Aug 01, 2009 7:53 pm

If K is a positive integer, is K the square of an integer?
(1) K is divisible by 4
(2) K is divisible by exactly 4 different prime numbers

I always screw up these kinds of factors & integer questions. Any advice for solving these kinds of questions?

Thanks

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Source: Beat The GMAT — Problem Solving | Sat Aug 01, 2009 7:53 pm

tohellandback: Legendary Member; Posts: 752; Joined: Sun May 17, 2009 11:04 pm; Location: Tokyo; Thanked: 81 times; GMAT Score:680

by tohellandback » Sun Aug 02, 2009 6:32 am

IMO E
sorry if there is a typo. I am posting from my phone.
1) 12- not a square
16- a square
not suff

2) for the number to be a square the prime factors should have rcen powers.
Not suff.
Combined, we still need to know the powers for those prime factors

The powers of two are bloody impolite!!

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