Question 61095
which one of these numbers are prime and how do i show my work?
12,31,99,1 
i think 1 is prime because you only have 0,1
PRIME NUMBER IS 
A NUMBER WHICH HAS NO FACTORS (THAT IS NOT DIVISIBLE LEAVING ZERO REMAINDER 
-BY ANY NUMBER)EXCEPT 1 AND ITSELF.
BUT THERE IS ANEXCEPTION..AS A RULE 1 IS NOT CLASSIFIED AS A PRIME NUMBER.
THE ONLY METHOD IS TO CHECK BY DIVISION STARTING FROM 2,3,ETC...
12 IS NOT AS IT IS DIVISIBLE BY 2
31 IS PRIME AS 2,3,5,7 ARE NOT FACTORS..NEED NOT GO BEYOND SINCE 7*5=35>31
THAT IS SECOND FACTOR IS LESS THAN THE FIRST FACTOR AND TILL THIS STAGE SECOND FACTOR IS MORE THAN THE FIRST FACTOR 5*7=35>31
99 IS NOT PRIME...AS IT IS DIVISIBLE BY 3
1 IS NOT PRIME BY DEINITION