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Io, (削除) 85 (削除ここまで) 78 bytes

Doesn't work for huge numbers. Historical submissions

method(i,c :=0;i repeat(I,if(i%(I+2)<1,c=c+1;while(i%(I+2)<1,i=i/(I+2))));c<2)

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Explanation

method(i, // Take an input
 c := 0 // Hold a counter of prime factors
 i repeat(I, // Repeat i times (counter I):
 if(i%(I+2)<1, // If i is divisible by I+2:
 c=c+1 // Add counter by 1
 while(i%(I+2)<1, // While i is divisible by I+2:
 i=i/(I+2) // Divide i by I+2
 )))
 c<2 // Is the factor counter equal to 1?
)