Question 107990
This is composite because it ends with 5---a signal that a number is divisible by 5


Let's divide and divide...


{{{345/5=69}}}
{{{69/3=23}}}
{{{23/23=1}}}


We divided by 3, 5, and 23. Thus, the prime factorization of 345 is {{{3*5*23}}}


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