There are 13 prime numbers from 4 to 50:
5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43 and 47
There are 4 prime numbers from 50 to 70:53, 59, 61 and 67
The question is quite ambiguous. If you're talking about all the even prime numbers between 4 and 50, then the sum is zero. No even number, except '2', is a prime number, so there aren't any between 4 and 50..
47 + 3 = 50, 43 + 7 = 50, 37 + 13 = 50, and 31 + 19 = 50. 4 pairs of prime numbers have a sum of 50. 53 + 7 = 60, 47 + 13 = 60, 43 + 17 = 60, 41 + 19 = 60, 37 + 23 = 60, and 31 + 29 = 60. 6 pairs of prime numbers have a sum of 60.
There are infinitely many numbers between 34 and 50 and so infinitely many sets of 4 numbers.
4, 9, 25 and 49 They are squares of prime numbers.
4.
There are 4 prime numbers, 2, 3, 5 and 7.
1, 4, 10, 20, 25, 50, 100
24 of them.
As a product of its prime factors: 2*2*7*7 = 196
No they are not prime numbers because 4 is composite.
4 is not prime.