Question

explain why (2×3×5+3) is composite number​

Answer 1

$\huge{\mathfrak{\underline{\underline{NAMASTE\:}}}}$

Multiplication of prime and composite is always composite...

Composite+ prime =composite

Answer 2

2x3x5+3=33

33 is divisible by 3 so

according to fundamental theorem of arithmetic (2x3x5+3) is a composite number.