Prime numbers are numbers that are only divisible by themselves and 1. For example, 3 is a prime number, but 4 isn't (because 4 is divisible by 2). You can think of prime numbers as very small families: they only ever have two people in them! Only themselves and 1. You can't fit any other numbers into them with nothing left over. 5 is one of these lonely numbers (only 5 × 1 = 5), but you can see that 6 has 2 and 3 in its family as well (6 × 1 = 6, 2 × 3 = 6). So 6 is not a prime number. Use the arrow keys to navigate around the board and to avoid the Troggles. Press the spacebar to eat a number.
Priemgetalle is getalle wat net deur hulself en 1 gedeel kan word. Die getal 3 is byvoorbeeld 'n priemgetal, maar 4 is nie (want 4 kan deur 2 gedeel word). Dink so daaraan: die priemgetal-families is baie klein, want daar is net twee familielede! Dis net die getal sélf, en 1. Jy kan nie enige ander getalle daar inpas sonder dat iets oorbly nie. 5 is so 'n eensame getal (net 5 × 1 = 5), maar jy kan sien dat 6 ook vir 2 en 3 in sy familie het (6 × 1 = 6, 2 × 3 = 6). Die getal 6 is dus nie 'n priemgetal nie. Gebruik die pyl-knoppies om om die bord te beweeg en die troggels te vermy. Druk die spasiebalk om 'n getal te vreet.