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Question Number 10050 by ridwan balatif last updated on 22/Jan/17

$$\mathrm{h}\mathrm{ow}\mathrm{do}\mathrm{we}\mathrm{know}2017\mathrm{and}\mathrm{another}\mathrm{number}\mathrm{is}\mathrm{a}\mathrm{prime}\mathrm{number}?$$

Commented by prakash jain last updated on 22/Jan/17

$$2017\mathrm{is}\mathrm{a}\mathrm{prime}\mathrm{number}.$$$$\mathrm{Since}\mathrm{it}\mathrm{has}\mathrm{only}\mathrm{two}\mathrm{factors}$$$$1\mathrm{and}2017.$$

Commented by ridwan balatif last updated on 22/Jan/17

$$\mathrm{i}\mathrm{mean},\mathrm{example}3571\mathrm{is}\mathrm{prime}\mathrm{number}\mathrm{or}\mathrm{not}?$$$$\mathrm{if}\mathrm{prime}\mathrm{number},\mathrm{how}\mathrm{can}\mathrm{we}\mathrm{know}3571\mathrm{has}2\mathrm{factor}1\mathrm{and}3571?$$$$\mathrm{if}\mathrm{not}\mathrm{a}\mathrm{prime}\mathrm{number},\mathrm{how}\mathrm{can}\mathrm{we}\mathrm{know}\mathrm{that}?$$

Commented by mrW1 last updated on 22/Jan/17

$$thereisnogeneralwayorevena$$$$formulatocheckifanumberisa$$$$primenumber.ininternetyoumay$$$$findtoolswhichcanhelpyoutocheck$$$$ifanumberisprimeorwhichfactors$$$$ithas.$$$$ipersonallyuseafreeappcalled{}^{\prime }Big$$$$Integer{Calculator}^{\prime }forthispurpose.$$

Commented by mrW1 last updated on 22/Jan/17

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