French · Pronunciation Guide
sees when it stands alone — the "x" is pronounced as a plain "s", and the vowel is "ee", not the "i" of English "six".
One syllable. Its real complication is not stress but the three-way behaviour of the final "x", which changes depending on what follows — a pattern shared with "dix".
Listen: six
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Il est six heures et demie.
It's half past six.
Listen: Il est six heures et demie.
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"Il est six heures et demie" uses the liaison form: "six heures" is /si.z‿œʁ/, with the "x" surfacing as a "z" and the silent "h" of "heures" letting the link happen. Then "et demie" follows with "et" as a bare /e/ — and remember "et" never makes a liaison, so there is no "t" sound before "demie".
English speakers say "siks", which is wrong on two counts: the vowel should be "ee", and the "x" is a single "s" rather than a "ks" cluster. Then, because they have learned one form, they use it everywhere — but "six" in "six personnes" has no final consonant at all, and in "six enfants" it is a "z". Learn all three shapes together rather than one and a rule to be applied later.