All U.S. army springfield rifles were chambered in 30-06 caliber.
30-06
With the serial number provided,your springfield model 1898 krag,was made in the year 1899.
probably 30/06 unless the barrel was changed.............
1934-1935 They were on limited production.
To determine the manufacture date and caliber of a Springfield Armory Model 1898, you'll need to check the serial number against historical records. Typically, these rifles were produced between 1898 and the early 1900s. The most common caliber for the Model 1898 is .30-40 Krag. For precise information, consult a dedicated resource or database specific to Springfield Armory firearms.
.30-40 krag
Your model 1898 krag was made by springfield armory in 1899.
Model 1911a1
30-06 but be forewarned that serial numbers below 800000 are dangerous to fire due to poor heat treatment. See: http://m1903.com/03rcvrfail/
Serial # N5102889 Made
Have to know what model of gun it is, than you could search by model and serial number. Try Fulton armory or doing an internet search.
about 1914