Yes, you can protect your 401(k) account through a prenuptial agreement. A prenuptial agreement, also known as a prenup or premarital agreement, is a legal document created before marriage that outlines the division of assets and other important matters in the event of a divorce.

When it comes to protecting your 401(k) in a prenuptial agreement, you can include provisions that state your 401(k) account will remain separate property and not subject to division in case of a divorce. This can help safeguard your retirement savings from being considered marital property during the equitable distribution process.

However, it's important to note that prenuptial agreements must meet certain requirements to be enforceable. These requirements can vary by jurisdiction, so it's crucial to consult with a qualified family law attorney who can guide you through the legal process and ensure that your prenuptial agreement is properly drafted and executed.

Additionally, it's worth mentioning that prenuptial agreements cannot address matters related to child custody or child support. These issues are typically decided by the court based on the child's best interests at the time of divorce.

Overall, a prenuptial agreement can be an effective tool for protecting your 401(k) account and other assets. However, it is advisable to consult with an attorney to ensure that the agreement is properly prepared, complies with the law, and serves your best interests.