No. Within a 45-day window, multiple credit checks from mortgage lenders are recorded on your credit report as a single inquiry. This is because other lenders realize that you are only going to buy one home. You can shop around and get multiple preapprovals and official Loan Estimates.
The impact on your credit is the same no matter how many lenders you consult, as long as the last credit check is within 45 days of the first credit check. Even if a lender needs to check your credit after the 45-day window is over, shopping around is usually still worth it. The effect of an additional inquiry is small, while shopping around for the best deal can save you a lot of money in the long run.