Hi
Don't know how you can find out? I don't know the details, but unless you have accompanied your spouse while he/she has been working for a Canadian company, Government of Canada etc, you have probably lost your PR status. Regardless, you can't apply for citizenship unless you have lived in Canada for at least three years.
1. His wife is a Canadian citizen, and if he has been accompanying while she is abroad, he maintains his PR status. She doesn't have to working for a gov;t or Canadian company.
2. But as you say, he can not apply for citizenship without 1095 days of physical residency in Canada in the 4 years prior to his application.
PMM