With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: The number of days per Revised Julian cycle = 900 × 365 + 218 = 328,718 days. Taking mod 7 leaves a remainder of 5, so like the Julian calendar, but unlike the Gregorian calendar, the Revised Julian calendar cycle does not contain a whole number of weeks. Therefore, a full repetition of the Revised Julian leap cycle with respect to the seven-day weekly cycle is seven times the cycle length = 7 × 900 = 6300 years.
text_B: If the number of days in a calendar is divisible by 7, can it be a Gregorian calendar?
YES.