feat(library/data/nat/primes): add is_prime
feat(library/data/nat/primes): add is_prime

eigengrau/lean,eigengrau/lean,leodemoura/lean,soonhokong/lean-windows,soonhokong/lean,fgdorais/lean,leodemoura/lean,leanprover/lean,leodemoura/lean,fpvandoorn/lean2,rlewis1988/lean,soonhokong/lean-windows,Kha/lean,c-cube/lean,Kha/lean,soonhokong/lean-windows,fpvandoorn/lean2,leanprover/lean,dselsam/lean,avigad/lean,UlrikBuchholtz/lean,soonhokong/lean-osx,leanprover/lean,fpvandoorn/lean2,leanprover-community/lean,fpvandoorn/lean,Kha/lean,avigad/lean,javra/lean,rlewis1988/lean,digama0/lean,fpvandoorn/lean,rlewis1988/lean,soonhokong/lean-osx,c-cube/lean,Kha/lean,fpvandoorn/lean2,UlrikBuchholtz/lean,leanprover-community/lean,soonhokong/lean-osx,leanprover/lean,leodemoura/lean,htzh/lean,javra/lean,soonhokong/lean-osx,UlrikBuchholtz/lean,avigad/lean,soonhokong/lean,c-cube/lean,sp3ctum/lean,leanprover-community/lean,fpvandoorn/lean,leodemoura/lean,soonhokong/lean,javra/lean,avigad/lean,levnach/lean,avigad/lean,digama0/lean,javra/lean,Kha/lean,soonhokong/lean,leanprover-community/lean,Kha/lean,leanprover/lean,dselsam/lean,dselsam/lean,fgdorais/lean,johoelzl/lean,htzh/lean,johoelzl/lean,soonhokong/lean,soonhokong/lean-windows,fpvandoorn/lean,avigad/lean,sp3ctum/lean,fpvandoorn/lean,soonhokong/lean-windows,leanprover/lean,johoelzl/lean,levnach/lean,htzh/lean,sp3ctum/lean,digama0/lean,htzh/lean,fgdorais/lean,fgdorais/lean,dselsam/lean,dselsam/lean,leodemoura/lean,digama0/lean,fgdorais/lean,johoelzl/lean,rlewis1988/lean,leanprover-community/lean,rlewis1988/lean,soonhokong/lean-osx,digama0/lean,c-cube/lean,eigengrau/lean,levnach/lean,htzh/lean,fpvandoorn/lean,sp3ctum/lean,levnach/lean,digama0/lean,sp3ctum/lean,eigengrau/lean,rlewis1988/lean,johoelzl/lean,leanprover-community/lean,dselsam/lean,javra/lean,UlrikBuchholtz/lean,fgdorais/lean,UlrikBuchholtz/lean,fpvandoorn/lean2,levnach/lean,eigengrau/lean,johoelzl/lean,c-cube/lean