Question

write a prgrm. to check a no is prime or not.​

Answer 1

class Prime

{

public static void main (int a )

{

for(int i = 1 ; i <= a ; ++a)

{

if (a%i == 0)

{ ++c;}

}

if(c == 2)

{

System.out.println("prime number");

}

else

{

System.out.println("Not a prime number");

}

}

}

Answer 2

public class PrimeBrainly

{

$~~$public static void main(int n)

$~~${

$~~~~$ int c = 1;

$~~~~$ int i = 0;

$~~~~$ while(c < = n)

$~~~~$ {

$~~~~$ if(n ℅ c == 0 )

$~~~~$ i++;

$~~~~$ }

$~~~~$ if(i == 2)

$~~~~$ System.out.println("Yes, the given number is a prime number.");

$~~~~$ else

$~~~~$ System.out.println("No, the given number is not a prime number.");

$~~$ }

}

Know more

A prime number is a number which has only two factors in all, which is necessarily one and itself.

For example, 3