# SOLUTION: I have read from the list that 103 421 is a prime number Is there a simple way to find if a number is a prime number or a composite number? I am very weak in maths. Thank yo

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 Click here to see ALL problems on Numbers Word Problems Question 351150: I have read from the list that 103 421 is a prime number Is there a simple way to find if a number is a prime number or a composite number? I am very weak in maths. Thank you for your attention. Answer by stanbon(57387)   (Show Source): You can put this solution on YOUR website!Is there a simple way to find if a number is a prime number or a composite number? I am very weak in maths. ---------------------------- Let's say you want to determine if 149 is a prime number. --- 1st: Find the square root of 149: sqrt(149) = 12.2... --- 2nd: See if 149 is evenly divisible by any prime less than 12.2 149/2 = 74.5 no 149/3 = 47.666 no 149/5 = 29.8 no 149/7 = 21.2.. no 149/11 = 13.54.. no ---- 3rd: If none of these primes divides 149, 149 is a prime number. ---- Cheers, Stan H.