Quadratic residues and composite moduli

Number Theory Level 4

Which of the following statements are true?

(1) 73 is a quadratic residue mod 5.

(2) 73 is a quadratic residue mod 83.

(3) 73 is a quadratic residue mod 415.

(4) $\left( \dfrac{73}{415} \right) = 1,$ where $\left( \dfrac{a}{n} \right)$ is the Jacobi symbol.