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           | Description | 
           
             English: An illustration of how 12 is not a prime number, but 11 is. 
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           | Date | 
           6 April 2007 | 
          
          
           | Source | 
            http://en.citizendium.org/wiki/Image:Prime_rectangles.png | 
          
          
           | Author | 
           Fredrik Johansson | 
          
         
         
        
         
        
        
         
          | Public domainPublic domainfalsefalse | 
         
        
        
         
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          This work has been released into the  public domain by its author, Fredrik Johansson. This applies worldwide. In some countries this may not be legally possible; if so: Fredrik Johansson grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.Public domainPublic domainfalsefalse 
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