Asked by Nikki
Which of these numbers is prime? Explain why or why not.
407
409
411
413
407
409
411
413
Answers
Answered by
Writeacher
http://en.wikipedia.org/wiki/Prime_number
So ... which of these can be <b>divided <u>evenly</i> only by itself and 1</b>?
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So ... which of these can be <b>divided <u>evenly</i> only by itself and 1</b>?
??</u>
Answered by
tchrwill
Which one(s) are evenly divisible by prime numbers less than the sqrt of the number. The square root of the largest is 20.32. Since they are all odd, 2 is not a divisor, Therefore, division by 3, 7, 11, 13, and 19 are the only tests.
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