Because it can be divided by numbers other than 1 and itself, for example 5615/5=1123
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The definition of a prime number is a whole number greater than 1, that can be divided evenly only by 1 and itself. 5615 ÷ 5 = 1123 (5 divides evenly into 5615, therefore not a prime number).
7 is a prime number!
109 is a prime number.
167 is a prime number.
503 is a prime number.