No. It is an even number, divisible by 2, and is not prime.
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It is 7 because as a product of its prime factors: 2*2*5*7 = 140 or as 22*5*7 = 140
141
It is: 2*2*5*7 = 140 by dividing it by each prime number that has no remainder
140 is a composite number because it is an even number greater than 2.
140 is a composite number because it has more than two factors