A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is called a composite number.
#include <stdio.h> int main() { int n, i, x=0; printf("Enter a No: "); scanf("%d",&n); for(i=2;i<=n/2;++i) { if(n%i==0) { x=1; break; } } if (x==0) printf("%d is a prime number.",n); else printf("%d is not a prime number.",n); return 0; }
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