What are prime numbers and composite numbers? Can you be more detailed^-^

Prime number: 2,3,5,7,11,13,17,19,23,29. (only 1 and its two divisors)
Positive natural numbers other than 1 and prime numbers are composite numbers (except 1 and it has other divisors)

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1. Which of these numbers are prime numbers and which are composite numbers 15 157 97 28 19 960 138 37
2. Which of the following numbers are prime numbers and which are composite numbers? 27 13 16 2 7 87 100 63 57 5 92 73 41 33 17 61 11 14 35 37
3. Which of the following numbers are prime numbers and which are composite numbers? 1 13 27 41 57 61 73 84 95 47 11 15 33 49 51 63 87 99 Total number; Prime number; I find;
4. The product of two prime numbers must be______ ．
5. The product of two prime numbers must be______ ．
6. Is the product of multiplication of two prime numbers a composite number?
7. The product of two prime numbers must be a composite number?
8. The sum of two prime numbers must be a composite number,
9. Is the sum of two prime numbers a composite number
10. Among the factors of 24, the ones that are even numbers and prime numbers are (), the ones that are prime numbers and odd numbers are (), the ones that are even numbers and composite numbers are ()
11. The concept of prime number and composite number It's in the math book. I forgot to take it home
12. What are prime numbers and composite numbers based on
13. Write two composite numbers so that the sum of them is prime and the sum is the smallest______ And______ ．
14. What is the greatest common factor of the smallest prime number and the smallest composite number?
15. Write two numbers that are compound numbers and prime numbers with only a common factor of 1
16. 1: Among the four numbers 1, 2, 5 and 15, the prime number has () and the combined number has (), () is the common factor of these numbers 2: The minute hand of the clock goes from 3:25 to 3:40, and the minute hand () rotates () degrees 3: A is a natural number greater than 0. The greatest common factor of a is () and the least common multiple is 5: The numerator of a fraction is the smallest composite number, and the denominator is the smallest composite number in the odd number. The fraction is () 6: 350ml=( )L 7: The greatest common factor of 24 and 42 is (), 24 times () to get the least common multiple of 24 and 42
17. What are prime numbers and composite numbers?
18. What are the characteristics of prime numbers and composite numbers Urgent today!
19. What do prime numbers and composite numbers mean?
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