# SOLUTION: Sir I Need some help in how to determine whether the given number is prime or not for the large numbers. for ex.119547120987

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 Algebra: Divisibility and Prime Numbers Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Divisibility and Prime Numbers Question 375731: Sir I Need some help in how to determine whether the given number is prime or not for the large numbers. for ex.119547120987 Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!Numbers that end in 7 are sometimes divisible by 7 and 9. So check using 7 and 9. There are other guidelines too. Numbers that end in 2,4,6,8,0 are divisible by 2. Numbers that end in 3 are sometimes divisible by 3. Numbers that end in 0 or 5 are divisible by 5. Numbers that end in 6 are sometimes divisble by 2 and 3. Numbers that end in 9 are sometimes divisible by 3.