36 is both a square number and a triangle number as it is:
6x6=36
and
the square numbers are:
1, 3, 6, 10, 15, 21, 28, 36, 45,55, 66, 78.
xx
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Square, yes. Triangle, no.
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36 is a triangle number (1+2+3+4+5+6+8+9), a square (6*6) and an even number.
100 is a square.
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