Tater 134 is correct, it is not a so-called "training rifle." That rifle is a standard Type 38 that was transferred to school use. The "cannon balls" overstamp on the "mum" indicates it was processed out of service at Kokura Arsenal. The added zeros are just to make the serial number invalid in military records. The top symbol, between the "mum" and the "3 8 type" indicates the rifle was diverted to school use.
Those rifles could be and were fired and were used for military training at the college level. The so-called "training rifles" that were made to fire only blanks were intended for programs in the equivalent of high school.
Barring any problems, it should be safe to shoot.
FWIW, while I am no expert on the values of Japanese rifles today, those school rifles should bring a good price. Not only are they different from the ordinary "bringback", they are usually in excellent condition, having been transferred to the school long before the war and having remained there through the war years, being well maintained.
Jim