Method of Finding the Prime Number: Method 1: If there are 4 prime numbers between 1-10 , ( 2 , 3 , 5 , 6) and the sum of 2 , 3 , 5 , 6 cannot be divided by 18, that number is a prime number. For example, 96 cannot be divided by K (2 , 3 , 5 , 6 , 17) , so it is a prime number. But 161K (2 , 3 , 5 , 6 , 17) is divided by 7. So 181 is not a prime number. Method 2: Find out whether the number is a prime number ( 6 ) Please. Route Of the number In front Oh Back Basic The number With 3 Numbers Share Goes Whether See. If Share Goes However Basic Numbers No. E.g. 143 Of Route If you do Found Goes 11 . 98. Here 11 By itself Basic Numbers And Of Next Basic Numbers Hall 13. This Two Numbers Divided by 143. So this is not a prime number. That is, if we do not divide by 2 , 3 , 5 , 6 , 11 , 13 , 18, then the number is a prime number.