PathFinder007 wrote:
Bunuel wrote:
tarek99 wrote:
If k is a positive integer, is k the square of an integer?
(1) k is divisible by 4.
(2) k is divisble by exactly four different prime numbers.
(1) k is divisible by 4.
(2) k is divisble by exactly four different prime numbers.
Responding to a pm.
If k is a positive integer, is k the square of an integer?
(1) k is divisible by 4. Ifk=4 answer is YES, but ifk=8 answers is NO. Not sufficient.
(2) k is divisible by exactlyfour different prime numbers .
We don't know the powers of these primes, so ifk=2^2*3*5*7 the answer is NO, but ifk=(2^2*3*5*7)^2 the answer
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