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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- March 9th 2008, 05:50 PMrcmangowhich numbers are prime
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. - March 9th 2008, 06:24 PMtopsquark
- March 9th 2008, 08:51 PMrcmango
okay, 667 = 23 * 29

thankyou for the help.