Asked by Nikki

Which of these numbers is prime? Explain why or why not.

407
409
411
413
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>?

??</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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