They are: 3*7 = 21 and 2*2*2*5 = 40
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number 21 is prime
21 is a composite number, not a prime, having prime factors 3x7.
As a product of its prime factors: 2*2*2*5 = 40 or as 23*5 = 40
40 out of 103 is a fraction. Prime numbers are whole numbers. A fraction cannot be a prime number, so 40 out of 103 is not a prime number.
21 is the product of two prime numbers, three and seven. A prime number is defined as a number divisible only by one or itself. So ... NO ... 21 is not a prime number.