The product of two primes must be?

Two prime numbers (or prime numbers): there are no other factors except 1 and itself. The product of such two numbers has factors (these two prime numbers) besides 1 and itself, so it is not a prime number but a composite number

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1. The product of a prime number multiplied by an even number must be () A. Odd B. even C. prime
2. Is the product of two primes greater than 2 prime or even
3. There are many students reading books in the library. Boys account for 40%. Later, four boys came in. At this time, boys account for 7 / 16 of the total number. How many people were there in the library? Using X solution Formula: OK, if you want to score all OK, 5, 0.15.20 ~ 1OO
4. The average number of a, B and C is 40, the ratio of a to B is 3:2, C is equal to half of B, what are the numbers of a, B and C
5. The ratio of a, B and C is 5:3:4. The number of a is 20. How much less is the number of B than the number of a?
6. The number of a is five times that of B. what is the ratio of a and B, what is the ratio of the sum of a and B, and what is the ratio of a and B?
7. It takes 6 minutes for a part to be processed, 5 minutes for B and 4 minutes for C. now, 2220 parts are processed by 3 people in the same time, and each person is assigned How many parts of the mission? In proportion
8. The grain quality ratio of warehouse A and warehouse B is 8:7, one fourth of which is transported from warehouse A. if warehouse B increases by 6 tons, then warehouse B will have 14 tons more than warehouse A. how many tons each of warehouse A and warehouse B had
9. If you dream of becoming a spaceman when you____ up ,get started now!A spaceman n_____ a strong body and keen mind .You still have a long way to g_____ .Do you know what Shenzhou VI spaceman are able to do?Shenzhou VI spaceman are able to l______ upside down .They do this not just during s______ ,but also when eating and going to the toilet.Before f____ into space,they had lots of p____ .Echn upside-down training l____ for many days.They also have to know every part of the spaceship and how it w_____ .If something g____ wrong,they must know how to repair it. 1. ABCD and apqr are parallelogram, P, Q, R are on AB, AC, ad respectively, AP = 2qc, s quadrilateral ABCD = 36, then s quadrilateral apqr= A20 B24 C16 D18 2. Given a: B = C: D, then the middle term of the ratio of a & sup2; + C & sup2; and B & sup2; + D & sup2; is A、ac+bd B、ad+bc C、ad+cb D、ad+cd
10. lg20+log100（25）=_______ The solution of equation 2log3 (x) = 1 / 4 is________ log5(2)+2/3lg8+lg5lg20+(lg2)²=_________
11. The product of two primes is 94, and the sum of the two primes is______ ．
12. The product of two prime numbers is 94, the sum of these two prime numbers is (), and their greatest common factor is ()
13. 511 is not a prime number. Which two numbers' product = 511?
14. If both numbers are prime, then their product has a factor
15. A number () and two factors () are called prime numbers
16. If () has two factors, such a number is called prime or (). The smallest prime is ()
17. The maximum factor of a number is 2001, and the minimum multiple of the number is (). The sum of two prime numbers is 2001, and the product of the two prime numbers is ()
18. The least common multiple of two primes is 91, and the sum of the two primes is______ ．
19. The least common multiple of two primes is 111. What are the two and how many
20. The least common multiple of the three prime numbers is 78, which are (), (), ()