[Vuejs]-Can I have a Vue app that has some static server rendered routes and some dynamic routes

In nuxt you could do this with serverMiddleware.

export default function(req, res, next) {
  const paths = ['/', '/a']

  if (paths.includes(req.originalUrl)) {
    // Will trigger the "traditional SPA mode"
    res.spa = true
  }
  // Don't forget to call next in all cases!
  // Otherwise, your app will be stuck forever :|
  next()
}

https://blog.lichter.io/posts/selectively-enable-ssr-or-spa-mode-in-a-nuxtjs-ap