Answer:
6*5*4*3*2*1+4*3*2*1-3*2*1 =
6*5*4*3*2*1+(4-1)*3*2*1=
6*5*4*3*2*1+3*3*2*1=
3*2*1*(6*5*4+3)
this number has more than 2 factors, therefore is composite
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