It is 1 that is neither a prime or a composite number because it has only one factor which is itself.
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The largest staircase comosite largest staircase composite is the number 2223 because 1 is not counted as a prime so the 1 digit prime is 2, the smalles 2 digit prime is 11 and smallest 3 digit prime is 101
7 is a prime number!
109 is a prime number.
167 is a prime number.
503 is a prime number.