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.
Zenbaki lehenak 1 zenbakiarengatik eta beraien buruarengatik bakarrik zatitu daitezkeen zenbakiak dira. Adibidez, 3 zenbakia zenbaki lehena da, baina 4 zenbakia ez (2 zenbakiarengatik zatitu baitaiteke). Zenbaki lehenak familia oso txikia izan balira bezala ikus ditzakezu: familia bakoitzak bi kide ditu, zenbaki bera eta 1 zenbakia. Ezin dituzu bestelako zenbakiak familia horretan sartu. 5 zenbakia 5x1 da eta zenbaki lehena da, baina 6 ez da zenbaki lehena beste bi zenbakiren arteko biderketa delako: 6=2x3. Erabili teklatuko geziak arbelean zehar nabigatzeko eta Troggleak saihesteko. Sakatu Zuriunea tekla zenbaki bat jateko.