primenumber=Awholenumbernotdivisiblewithoutaremainderbyanywholenumberotherthanitselfandone.素数,质数:只能被其本身和一整除而没有余数的整数Anintegergreaterthan1thatisonlyevenlydivisiblebyitself.Primenumbersareconsideredafundamentalbuildingblockofnumbers,especiallynumbertheory,abranchofmathematics.Thefirst10primenumbersare2,3,5,7,11,13,17,19,23and29.Exceptfor2,allprimesareoddnumbers.Asthenumbersgethigher,primenumberstendtobefoundinpairs;forexample,29,669and29,671.Thelargestprimenumberthusfar,whichcontainsmorethan65,000digits,wasdiscoveredin1986.