There are infinitely many of them For example, pi/2, +sqrt(0.7), 23456.789
they are,7,11,13,17,19
alot of odd numbers such as 7,9,11 and so on
Even numbers greater than 2 can't be prime. Multiples of 5 greater than 5 can't be prime.
Not if either of the numbers is between 0 and 1. 5*0.5 = 2.5 is not greater than 5 0.3*0.4 = 0.12 is smaller than both multiplicands.
Unless this is a trick question, the answer is that there are no such numbers.