36 is a triangle number (1+2+3+4+5+6+8+9), a square (6*6) and an even number.
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Square, yes. Triangle, no.
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25 25 is not even and is a square. 3 is not even or a square.
100 is a square.
36 is both a square number and a triangle number as it is:6x6=36andthe square numbers are:1, 3, 6, 10, 15, 21, 28, 36, 45,55, 66, 78.xx