Program

 #include<stdio.h>
 int main(){ 
 int i=2,n,p=0;
 printf("n Enter a number : ");
 scanf("%d",&amp;n);
 while(i &lt;=n/2) 
{ if(n % i == 0)
 { p=1; break; } i++;
} if(p==0) printf("n This Is a Prime Number : %d",n);
 else printf("n This Is Not a Prime Number : %d",n); 
  return 0; }

Output:-Enter a number : 149 This Is a Prime Number : 149

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