Check whether the following numbers are prime or composite
i) 2x3+5
ii) 7x11x13+13
iii) 3x7+2
iv) 13x17x19+23x38

1- 2*3+5=6+5= 11  prime no
2- 7*11*13+13 = 77*13+13= 1014 composite no
3- 7*3+2= 23     prime no
4- 13*17*19+23+38 = 4260  composite no
hope it will help