Study the given letter, symbol series and answer the question that follows: # 9 1 @ 4 * 7 ^ 5 3 # 9 1 < 5 4 @ 3 $ 3 # 2 * 6 ! 4 2 < 9 < 3 6 # 2 % 2 @ 7 If all even numbers in the given series are replaced with a number which is prime as well as even, then how many numbers are there in the resultant series thus formed which are immediately preceded by a prime number and immediately followed by a symbol?