Question 107997

If any # can divide into 345 evenly then 345 has to be a composite number. The word composite is like compound, a compound sentence has more than one idea, and a composite number has more factors than just 1 and the # itself. Since 345 ends in a 5, then 5 will divide into 345 evenly. Also, if you add the digits of 345: 3+4+5 =12 and 12 is a multiple of 3, then we know 3 will also divide evenly into 345 which proves it is truly a composite number.