5 x 7.
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37, 41, and 43 are prime numbers.
Only 35 is a composite number; the rest are prime numbers.
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
24 is divisible by 2 and 35 is divisible by 5. 31 has only two factors: 1 and itself. 31 is the prime number.
The given numbers of 15 and 35 are not prime numbers but they add up to 50