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

h ow do we know 2017 and another number  is a prime number?

Commented byprakash jain last updated on 22/Jan/17

2017 is a prime number.   Since it has only two factors  1 and 2017.

Commented byridwan balatif last updated on 22/Jan/17

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

Commented bymrW1 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 bymrW1 last updated on 22/Jan/17