import numpy as np
a = np.arange(1000000).reshape(1000,1000)
print(a**2)

[[         0          1          4 ...,     994009     996004     998001]
 [   1000000    1002001    1004004 ...,    3988009    3992004    3996001]
 [   4000000    4004001    4008004 ...,    8982009    8988004    8994001]
 ...,
 [1871554624 1873548625 1875542628 ..., -434400663 -432404668 -430408671]
 [-428412672 -426416671 -424420668 ..., 1562593337 1564591332 1566589329]
 [1568587328 1570585329 1572583332 ..., -733379959 -731379964 -729379967]]

In [1]: np.arange(1000000).dtype
Out[1]: dtype('int32')

a=np.arange(1000000,dtype='int64').reshape(1000,1000)

import numpy
a=numpy.arange(1000,dtype=object)
a**20

{{{
 _mapper = [(nx.bool_, str2bool, False),
            (nx.integer, int, -1),
            (nx.floating, float, nx.nan),
            (complex, _bytes_to_complex, nx.nan + 0j),
            (nx.string_, bytes, asbytes('???'))]
}}}

{{{
 _mapper = [(nx.bool_, str2bool, False),
            (nx.int64, int, -1),
            (nx.floating, float, nx.nan),
            (complex, _bytes_to_complex, nx.nan + 0j),
            (nx.string_, bytes, asbytes('???'))]
 }}}