From inside the MySQL CLI:
show status like 'qc%';

It will produce output like this:
mysql> show status like 'qc%';

+-------------------------+----------+
| Variable_name           | Value    |
+-------------------------+----------+
| Qcache_queries_in_cache | 68241    |
| Qcache_inserts          | 22305222 |
| Qcache_hits             | 60296383 |
| Qcache_lowmem_prunes    | 147163   |
| Qcache_not_cached       | 081538   |
| Qcache_free_memory      | 91055320 |
| Qcache_free_blocks      | 8663     |
| Qcache_total_blocks     | 14233    |
+-------------------------+----------+
8 rows in set (0.00 sec)

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