1. It's a perfect square
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15 is a composite number
100
It is an odd number. It is not prime. Its factors are 1, 3, 7 and 21. It is positive.
The number 16 is when you can drive and have a sweet 16 with your buddies and have a crazy party. It's the time when you become a man.
((1*2*3) -4 + 5) *6= 42 satans number times gods number= 6*7= 42