Question Number 10050 by ridwan balatif last updated on 22/Jan/17
$$\mathrm{h}\:\mathrm{ow}\:\mathrm{do}\:\mathrm{we}\:\mathrm{know}\:\mathrm{2017}\:\mathrm{and}\:\mathrm{another}\:\mathrm{number}\:\:\mathrm{is}\:\mathrm{a}\:\mathrm{prime}\:\mathrm{number}? \\ $$
Commented by prakash jain last updated on 22/Jan/17
$$\mathrm{2017}\:\mathrm{is}\:\mathrm{a}\:\mathrm{prime}\:\mathrm{number}.\: \\ $$$$\mathrm{Since}\:\mathrm{it}\:\mathrm{has}\:\mathrm{only}\:\mathrm{two}\:\mathrm{factors} \\ $$$$\mathrm{1}\:\mathrm{and}\:\mathrm{2017}.\: \\ $$
Commented by ridwan balatif last updated on 22/Jan/17
$$\mathrm{i}\:\mathrm{mean},\:\mathrm{example}\:\mathrm{3571}\:\mathrm{is}\:\mathrm{prime}\:\mathrm{number}\:\mathrm{or}\:\mathrm{not}? \\ $$$$\mathrm{if}\:\mathrm{prime}\:\mathrm{number},\:\mathrm{how}\:\mathrm{can}\:\mathrm{we}\:\mathrm{know}\:\mathrm{3571}\:\mathrm{has}\:\mathrm{2}\:\mathrm{factor}\:\mathrm{1}\:\mathrm{and}\:\mathrm{3571}? \\ $$$$\mathrm{if}\:\mathrm{not}\:\mathrm{a}\:\mathrm{prime}\:\mathrm{number},\:\mathrm{how}\:\mathrm{can}\:\mathrm{we}\:\mathrm{know}\:\mathrm{that}? \\ $$
Commented by mrW1 last updated on 22/Jan/17
$${there}\:{is}\:{no}\:{general}\:{way}\:{or}\:{even}\:{a} \\ $$$${formula}\:{to}\:{check}\:{if}\:{a}\:{number}\:{is}\:{a} \\ $$$${prime}\:{number}.\:{in}\:{internet}\:{you}\:{may} \\ $$$${find}\:{tools}\:{which}\:{can}\:{help}\:{you}\:{to}\:{check} \\ $$$${if}\:{a}\:{number}\:{is}\:{prime}\:{or}\:{which}\:{factors} \\ $$$${it}\:{has}. \\ $$$${i}\:{personally}\:{use}\:{a}\:{free}\:{app}\:{called}\:'{Big}\: \\ $$$${Integer}\:{Calculator}'\:{for}\:{this}\:{purpose}. \\ $$
Commented by mrW1 last updated on 22/Jan/17
