you see if it can be divided by any numbers that are not 1 or itself
17,017
By dividing it by the prime factors that have no remainders
To find twin primes of a given number, iterate through the numbers starting from the given number, and for each number, check if both the number and the number+2 are prime. If they are, then they form a pair of twin primes with the given number.
A number which is divisible by itself and 1 is called prime number. A prime number has only two factors.But, 836475 is also divisible by5, i.e. 836475 has more than two factors.Therefore, the given number is not prime.In order to show that given number is not prime there is no need to find all the factors, we should show that given number has more than two factors.
Prime numbers have two and only two factors. If the number has more than two factors, it is not prime.
#include<stdio.h> #include<conio.h> void main() { int n,a=2; clrscr(); printf("\n enter n"); scanf("%d",&n); if(i<=a-1) { if(a%i==0) { printf("\n the given number is not a prime number"); break; } i++; if(a==i) { printf("\n the given number is a prime number"); } getch(); output: enter the value of n:2 the given number is prime number
they can help you by finding the two factors of the number given
No. A given number need not even be divisible by a given prime.
Sure, since there are INFINITELY MANY prime numbers, that means you will find prime numbers over any given number.
That's a prime factor.
The only even prime number is 2.
prime factor = prime number which can be divided into the given number with no remainder ie 2