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63
3
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People think it's prime

 Mar 20, 2022
 #1
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No, the factors of 51 are 1, 3, 17, 51

 Mar 20, 2022
 #2
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Is 51 a prime number ... People think it's prime  

 

Well, those people are wrong.  You can factor 51 to (3 • 17)  

 Mar 21, 2022
 #3
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To see if that is prime or not, you could check its divisibility rules.

If it is divisible by 2, then it is an even number---51 is odd.

If it is divisible by 3, then the digits sum to a number divisible by 3, 5 + 1 = 6, and 6 is divisible by 3.

Thus, 51 is divisible by 3.

 

Remember the divisibility rules Guest!

 

yw

 Mar 24, 2022

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