which numbers are prime? a. 667 b. 557 i tried using numbers like (23)^2 and (24)^2 I didn't know how to prove this. Please show what needs to be done.
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Originally Posted by rcmango which numbers are prime? a. 667 b. 557 i tried using numbers like (23)^2 and (24)^2 I didn't know how to prove this. Please show what needs to be done. Try factoring them. For example, divide 667 by 2. It gives a decimal. So try 667/3, 667/5, 667/7 until you get to about . If you have no factors yet, then the number is prime. I get that 557 is prime and 667 is composite. -Dan
okay, 667 = 23 * 29 thankyou for the help.
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