Multiplicative identity.
Because for any number a, 1*a = a
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The Fibonacci sequence.
it is the first number
I will assume you mean "positive integers". In this case, the only number that is considered neither prime nor composite is the number 1. 1 has the special role of the identity element of multiplication, meaning that if you multiply a number by 1, it remains unchanged.
the number 1 is a special number. The number 1 is a confusing number to deal with, but it is called a special number.Example: Is 1 prime or composite? It is neither.
Substituting a name is "evaluating". But there is no special name for substituting an expression.