Yes it is. Any whole number or integer ending with the digit 5 (other than the number 5 itself) is composite.
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It is a composite number.
45 is a composite since it factors are 5 and 9.
13 and 19 are prime. 33 and 45 are composite.
Of these, 45 is the only composite number. All the others are prime.
It is a composite number because it has more than two factors