[Encounter] How to calculate clock frequency

Dear

As a newbie, my goal is to obtain clock frequency of the "core
design", after routing, in SOC Encounter 6.2.

My procedure was: Import -> Specify floorplaning -> Power ring and
stripes -> Specify clock tree -> Place -> Route -> Timing optimize.

When I tried to analyze timing, following result was obtained:

+--------------------+---------+---------+---------+---------+---------
+---------+
| Setup mode | all | reg2reg | in2reg | reg2out |
in2out | clkgate |
+--------------------+---------+---------+---------+---------+---------
+---------+
| WNS (ns): | -0.244 | -0.244 | 1.329 | N/A | N/
A | N/A |
| TNS (ns): | -15.52 | -15.520 | 0.000 | N/A | N/
A | N/A |
| Violating Paths:| 208 | 208 | 0 | N/A |
N/A | N/A |
| All Paths: | 5016 | 2172 | 3288 | N/A | N/
A | N/A |
+--------------------+---------+---------+---------+---------+---------
+---------+

+--------------------+---------+---------+---------+---------+---------
+---------+
| Hold mode | all | reg2reg | in2reg | reg2out |
in2out | clkgate |
+--------------------+---------+---------+---------+---------+---------
+---------+
| WNS (ns): | -2.099 | -0.001 | -2.099 | N/A | N/
A | N/A |
| TNS (ns): | -5187.8 | -0.001 | -5187.8 | N/A | N/
A | N/A |
| Violating Paths:| 3097 | 1 | 3096 | N/A | N/
A | N/A |
| All Paths: | 5016 | 2172 | 3288 | N/A | N/
A | N/A |
+--------------------+---------+---------+---------+---------+---------
+---------+

My question is that :

1. Can we derive the clock frequency from above?

2. If yes, when clock period constraint = 2 ns, is following
calculation correct?

Clock frequency of core = 1/(2 + 0.244 + 0.001) = 444MHz.

3. In summaryReport, following timing information is found.
I do not understand why "#clocks in design = 0".
Does this mean that "CTS" is not correct?

Timing Information
---------------------------------------------------
# Clocks in design = 0
# Generated clocks = 0
# "dont_use" cells from .libs = 67
# "dont_touch" cells from .libs = 60
# Cells in .lib with max_tran = 829
# Cells in .lib with max_cap = 828
# Cells in .lib with max_fanout = 0