Only if one or the other of you make it one.
Sexual history is fairly unimportant. Sexual health and compatibility are, of course, but it doesn't matter how long somebody's list of conquests is, provided neither of you actually care.
So, unless you think he'll make it an issue, let it go. If he's good in bed, and you're happy, don't wreck it.
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Can't speak for your man of course, but it is a big issue for some people, even a dealbreaker. Indeed I've all but given on helping my wife's cousin find a white American because she demands her future husband be like yours, just a few long term relationships, and not scoring the most women possible She won't even speak to a guy if that's the case. To her, it speaks of fickleness and inability to be satisfied by a single partner for the long term. If that doesn't apply to you, then don't worry about it.
Then you have the reverse - people who expect potential partners to have had sex with many. In their mindset, sleeping with 1 person 10,000 times is the same as sleeping with one person once you are clueless about sex and a loser. So they assume number of partners equals, as if it is impossible to learn from a single individual. Obviously that is not you since you are marrying the guy.
How old is he? Because unless he's quite mature, 4 long-term serious relationships doesn't exactly seem a tiny amount.
Anyway, you both have different things to bring to a relationship, don't underestimate the value of being in a relationship for such a long time, you get the experience of meeting your partner's needs in the long term as well as the short. While you've learnt to adapt to many different partner's needs, he's learnt to adjust to specific people's.
It's kinda like you've been eating finger food, and he's been eating stew, so you both have things to bring to the table. Yay food metaphors.