I am sorry but there are no references to the number 69 in the Holy Scriptures.
10 commandments
Biblically, cats do not represent anything. There are many people believe that black cats represent evil and bad things.
There were 13 people at the last supper 12 disciples and Jesus.
Samuel the prophet.
The number twelve signifies a divine organizational arrangement. For example, there were 12 tribes of Israel and 12 apostles. In each case, the arrangement was instituted by God.
The 50 days of Easter till Pentecost. This is the celebration of Jesus' Resurrection and the finally of the Disicples receiving the Holy Spirit in Tongues of Fire.
Numerology
No, 69 is not a square number.
69
The circle represents fertility, the feminine spirit or force, the cosmos or a spiritualized Mother Earth, unity, and wholeness.
69-69-69 ;)
69 is a composite number because it is a multiple of 3 and 23.