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Bunuel
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Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
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chetan2u
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GMAT Focus 1: 735 Q90 V89 DI81
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in case you are having a difficulty in checking whether a number is prime or not you can follow this simple step:
calculate (n)^(1/2) and take its succeeding integral value = y,
for ex. n = 89
y = 10
now check only for numbers in range (2,y) including 2 and y,
if you find any factor then it is not a prime..

in this way you need not to check for all the numbers between 1 and 89


''hope you find this helpful"
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