They are both composite because they are even.
They are composite numbers because 36 can be formed by 6x6 and 72 can be formed by 6x6x2. Since prime numbers means that they are only divisible by 1 and itself, the numbers are not prime numbers. Also, any number greater than 1 is either a composite or prime number, so they are composite numbers.
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29 and 31 are prime. The rest are composite.
29 is prime. 36 and 87 are composite.
62 is not a prime number. It is composite. 62=2*31
Composite
Composite