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The equation of state for an ideal gas is simple, which is P = n k B T . In the case of imperfect gases where mutual interactions among the constituents are important, pressure P can be expressed as the series expansion of density n with appropriate coefficients, known as virial coefficients B m . In this paper, we have obtained the first four virial coefficients for a model interaction potential Φ (r) using multidimensional Monte-Carlo integration and importance sampling methods. Next, we perform molecular dynamics simulations with the same Φ (r) for a many-particle system to obtain P as a function of T and n. We compare our numerical data with the virial equation of state. The plot of Mayer function f(r) as a function of radial distance r for Θ (r) for different inverse temperature β . [ABSTRACT FROM AUTHOR]