Cuarenta y nueve
If you are asking how to name those letters in Spanish, it would be EH-kees EH-leh EE EH-kees. If you mean the number 49 (which you have given in Roman numerals), it is cuarenta y nueve.
No, 49 is not prime: 49=72
To say 'I have a microwave' in Spanish, you would say 'Tengo una microonda.'
To say 'I have a notebook' in Spanish, you would say 'Tengo un cuaderno.'
To say 'furniture shop' in Spanish, you would say 'muebleria.'
To say 'rich' in Spanish, you would say 'rico.'
To say 'condensation' in Spanish, you would say 'condensación.'
To say 'evaporation' in Spanish, you would say 'evaporación.'
To say 'decompostion' in Spanish, you would say 'descomposición.'
To say 'knives' in Spanish, you would say 'cuchillos.'
You would say "español". It is not normally capitalized.
To say "to skate" in Spanish, you would say "patinar".